21113313012 has 48 divisors (see below), whose sum is σ = 59714424000. Its totient is φ = 6397973280.

The previous prime is 21113313007. The next prime is 21113313073. The reversal of 21113313012 is 21031331112.

21113313012 is a `hidden beast` number, since 21 + 11 + 331 + 301 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8884887 + ... + 8887262.

It is an arithmetic number, because the mean of its divisors is an integer number (1244050500).

Almost surely, 2^21113313012 is an apocalyptic number.

21113313012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21113313012 is an abundant number, since it is smaller than the sum of its proper divisors (38601110988).

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

21113313012 is a wasteful number, since it uses less digits than its factorization.

21113313012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17772173 (or 17772165 counting only the distinct ones).

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

Adding to 21113313012 its reverse (21031331112), we get a palindrome (42144644124).

The spelling of 21113313012 in words is "twenty-one billion, one hundred thirteen million, three hundred thirteen thousand, twelve".