21312404012 has 12 divisors (see below), whose sum is σ = 38206383096. Its totient is φ = 10396294560.

The previous prime is 21312403999. The next prime is 21312404021. The reversal of 21312404012 is 21040421312.

It is a super-2 number, since 2×21312404012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64976678 + ... + 64977005.

It is an arithmetic number, because the mean of its divisors is an integer number (3183865258).

Almost surely, 2^21312404012 is an apocalyptic number.

It is an amenable number.

21312404012 is a deficient number, since it is larger than the sum of its proper divisors (16893979084).

21312404012 is a wasteful number, since it uses less digits than its factorization.

21312404012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129953728 (or 129953726 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21312404012 its reverse (21040421312), we get a palindrome (42352825324).

The spelling of 21312404012 in words is "twenty-one billion, three hundred twelve million, four hundred four thousand, twelve".