21313103112 has 72 divisors (see below), whose sum is σ = 67147159950. Its totient is φ = 6089457024.

The previous prime is 21313103069. The next prime is 21313103129. The reversal of 21313103112 is 21130131312.

It can be written as a sum of positive squares in only one way, i.e., 18827681796 + 2485421316 = 137214^2 + 49854^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3017037 + ... + 3024092.

Almost surely, 2^21313103112 is an apocalyptic number.

It is an amenable number.

21313103112 is an abundant number, since it is smaller than the sum of its proper divisors (45834056838).

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

21313103112 is a wasteful number, since it uses less digits than its factorization.

21313103112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6041155 (or 6041141 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21313103112 its reverse (21130131312), we get a palindrome (42443234424).

The spelling of 21313103112 in words is "twenty-one billion, three hundred thirteen million, one hundred three thousand, one hundred twelve".