21310031112 has 32 divisors (see below), whose sum is σ = 54178048800. Its totient is φ = 6982947584.

The previous prime is 21310031059. The next prime is 21310031161. The reversal of 21310031112 is 21113001312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21310031091 and 21310031100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7523313 + ... + 7526144.

It is an arithmetic number, because the mean of its divisors is an integer number (1693064025).

Almost surely, 2^21310031112 is an apocalyptic number.

It is an amenable number.

21310031112 is an abundant number, since it is smaller than the sum of its proper divisors (32868017688).

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

21310031112 is a wasteful number, since it uses less digits than its factorization.

21310031112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15049525 (or 15049521 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21310031112 its reverse (21113001312), we get a palindrome (42423032424).

The spelling of 21310031112 in words is "twenty-one billion, three hundred ten million, thirty-one thousand, one hundred twelve".