21102221210 has 64 divisors (see below), whose sum is σ = 46941907968. Its totient is φ = 6664556544.

The previous prime is 21102221191. The next prime is 21102221213. The reversal of 21102221210 is 1212220112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21102221213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132719 + ... + 244578.

It is an arithmetic number, because the mean of its divisors is an integer number (733467312).

Almost surely, 2^21102221210 is an apocalyptic number.

21102221210 is an abundant number, since it is smaller than the sum of its proper divisors (25839686758).

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

21102221210 is a wasteful number, since it uses less digits than its factorization.

21102221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377375.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21102221210 its reverse (1212220112), we get a palindrome (22314441322).

It can be divided in two parts, 211022 and 21210, that added together give a palindrome (232232).

The spelling of 21102221210 in words is "twenty-one billion, one hundred two million, two hundred twenty-one thousand, two hundred ten".