21312212110 has 64 divisors (see below), whose sum is σ = 44085888000. Its totient is φ = 7266557952.

The previous prime is 21312212107. The next prime is 21312212219. The reversal of 21312212110 is 1121221312.

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, 15233191 + ... + 15234589.

It is an arithmetic number, because the mean of its divisors is an integer number (688842000).

Almost surely, 2^21312212110 is an apocalyptic number.

21312212110 is an abundant number, since it is smaller than the sum of its proper divisors (22773675890).

21312212110 is a wasteful number, since it uses less digits than its factorization.

21312212110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21312212110 its reverse (1121221312), we get a palindrome (22433433422).

The spelling of 21312212110 in words is "twenty-one billion, three hundred twelve million, two hundred twelve thousand, one hundred ten".