212121000010 has 8 divisors (see below), whose sum is σ = 381817800036. Its totient is φ = 84848400000.

The previous prime is 212120999929. The next prime is 212121000029. The reversal of 212121000010 is 10000121212.

It can be written as a sum of positive squares in 2 ways, for example, as 182235925881 + 29885074129 = 426891^2 + 172873^2 .

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

It is a super-3 number, since 3×212121000010³ (a number of 35 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: 21212100001 = 212121000010 / (2 + 1 + 2 + 1 + 2 + 1 + 0 + 0 + 0 + 0 + 1 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10606049991 + ... + 10606050010.

Almost surely, 2^212121000010 is an apocalyptic number.

212121000010 is a deficient number, since it is larger than the sum of its proper divisors (169696800026).

212121000010 is a wasteful number, since it uses less digits than its factorization.

212121000010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21212100008.

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

Adding to 212121000010 its reverse (10000121212), we get a palindrome (222121121222).

The spelling of 212121000010 in words is "two hundred twelve billion, one hundred twenty-one million, ten", and thus it is an aban number.