21588651412 has 6 divisors (see below), whose sum is σ = 37780139978. Its totient is φ = 10794325704.

The previous prime is 21588651361. The next prime is 21588651431. The reversal of 21588651412 is 21415688512.

It can be written as a sum of positive squares in only one way, i.e., 20299410576 + 1289240836 = 142476^2 + 35906^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2698581423 + ... + 2698581430.

Almost surely, 2^21588651412 is an apocalyptic number.

It is an amenable number.

21588651412 is a deficient number, since it is larger than the sum of its proper divisors (16191488566).

21588651412 is a wasteful number, since it uses less digits than its factorization.

21588651412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5397162857 (or 5397162855 counting only the distinct ones).

The product of its digits is 153600, while the sum is 43.

The spelling of 21588651412 in words is "twenty-one billion, five hundred eighty-eight million, six hundred fifty-one thousand, four hundred twelve".