21313112212 has 36 divisors (see below), whose sum is σ = 44987809440. Its totient is φ = 8653439952.

The previous prime is 21313112201. The next prime is 21313112267. The reversal of 21313112212 is 21221131312.

It is a super-2 number, since 2×21313112212² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21313112212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1044162 + ... + 1064377.

Almost surely, 2^21313112212 is an apocalyptic number.

It is an amenable number.

21313112212 is an abundant number, since it is smaller than the sum of its proper divisors (23674697228).

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

21313112212 is a wasteful number, since it uses less digits than its factorization.

21313112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108588 (or 2108567 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 21313112212 its reverse (21221131312), we get a palindrome (42534243524).

The spelling of 21313112212 in words is "twenty-one billion, three hundred thirteen million, one hundred twelve thousand, two hundred twelve".