21044817124 has 6 divisors (see below), whose sum is σ = 36828429974. Its totient is φ = 10522408560.

The previous prime is 21044816977. The next prime is 21044817133. The reversal of 21044817124 is 42171844012.

It can be written as a sum of positive squares in only one way, i.e., 15645506724 + 5399310400 = 125082^2 + 73480^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21044817124.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630602137 + ... + 2630602144.

Almost surely, 2^21044817124 is an apocalyptic number.

It is an amenable number.

21044817124 is a deficient number, since it is larger than the sum of its proper divisors (15783612850).

21044817124 is a wasteful number, since it uses less digits than its factorization.

21044817124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5261204285 (or 5261204283 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The spelling of 21044817124 in words is "twenty-one billion, forty-four million, eight hundred seventeen thousand, one hundred twenty-four".