21312202110 has 64 divisors (see below), whose sum is σ = 51890319360. Its totient is φ = 5601467520.

The previous prime is 21312202081. The next prime is 21312202129. The reversal of 21312202110 is 1120221312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21312202110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 607509 + ... + 641631.

It is an arithmetic number, because the mean of its divisors is an integer number (810786240).

Almost surely, 2^21312202110 is an apocalyptic number.

21312202110 is an abundant number, since it is smaller than the sum of its proper divisors (30578117250).

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

21312202110 is a wasteful number, since it uses less digits than its factorization.

21312202110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34433.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21312202110 its reverse (1120221312), we get a palindrome (22432423422).

The spelling of 21312202110 in words is "twenty-one billion, three hundred twelve million, two hundred two thousand, one hundred ten".