210121210 has 32 divisors (see below), whose sum is σ = 414004752. Its totient is φ = 76308480.

The previous prime is 210121199. The next prime is 210121217. The reversal of 210121210 is 12121012.

210121210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

210121210 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 8 ways, for example, as 41718681 + 168402529 = 6459^2 + 12977^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

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

It is not an unprimeable number, because it can be changed into a prime (210121217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5319 + ... + 21178.

Almost surely, 2^210121210 is an apocalyptic number.

210121210 is a deficient number, since it is larger than the sum of its proper divisors (203883542).

210121210 is a wasteful number, since it uses less digits than its factorization.

210121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26578.

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

The square root of 210121210 is about 14495.5582852127. The cubic root of 210121210 is about 594.5065324524.

Adding to 210121210 its reverse (12121012), we get a palindrome (222242222).

It can be divided in two parts, 21012 and 1210, that added together give a palindrome (22222).

The spelling of 210121210 in words is "two hundred ten million, one hundred twenty-one thousand, two hundred ten".