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212121010 = 2521212101
BaseRepresentation
bin11001010010010…
…11010110110010
3112210010212022201
430221023112302
5413300333020
633014253414
75153666413
oct1451132662
9483125281
10212121010
11a9811722
125b05726a
1334c3c3ba
142025980a
1513950a0a
hexca4b5b2

212121010 has 8 divisors (see below), whose sum is σ = 381817836. Its totient is φ = 84848400.

The previous prime is 212120983. The next prime is 212121023. The reversal of 212121010 is 10121212.

212121010 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

212121010 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 2 ways, for example, as 175748049 + 36372961 = 13257^2 + 6031^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×2121210103 (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 21212101 = 212121010 / (2 + 1 + 2 + 1 + 2 + 1 + 0 + 1 + 0).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10606041 + ... + 10606060.

Almost surely, 2212121010 is an apocalyptic number.

212121010 is a deficient number, since it is larger than the sum of its proper divisors (169696826).

212121010 is a wasteful number, since it uses less digits than its factorization.

212121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21212108.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 212121010 is about 14564.3746861992. The cubic root of 212121010 is about 596.3866254835.

Adding to 212121010 its reverse (10121212), we get a palindrome (222242222).

It can be divided in two parts, 21212 and 1010, that added together give a palindrome (22222).

The spelling of 212121010 in words is "two hundred twelve million, one hundred twenty-one thousand, ten".

Divisors: 1 2 5 10 21212101 42424202 106060505 212121010