21020211210 has 32 divisors (see below), whose sum is σ = 50459882112. Its totient is φ = 5604125760.

The previous prime is 21020211209. The next prime is 21020211269. The reversal of 21020211210 is 1211202012.

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 15 ways as a sum of consecutive naturals, for example, 60300 + ... + 213720.

It is an arithmetic number, because the mean of its divisors is an integer number (1576871316).

Almost surely, 2^21020211210 is an apocalyptic number.

21020211210 is an abundant number, since it is smaller than the sum of its proper divisors (29439670902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020211210 is a wasteful number, since it uses less digits than its factorization.

21020211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157998.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020211210 its reverse (1211202012), we get a palindrome (22231413222).

The spelling of 21020211210 in words is "twenty-one billion, twenty million, two hundred eleven thousand, two hundred ten".