21755253584 has 20 divisors (see below), whose sum is σ = 42523823316. Its totient is φ = 10781363712.

The previous prime is 21755253557. The next prime is 21755253607. The reversal of 21755253584 is 48535255712.

It can be written as a sum of positive squares in 2 ways, for example, as 8798440000 + 12956813584 = 93800^2 + 113828^2 .

It is a congruent number.

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, 6014579 + ... + 6018194.

Almost surely, 2^21755253584 is an apocalyptic number.

It is an amenable number.

21755253584 is a deficient number, since it is larger than the sum of its proper divisors (20768569732).

21755253584 is a wasteful number, since it uses less digits than its factorization.

21755253584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12032894 (or 12032888 counting only the distinct ones).

The product of its digits is 1680000, while the sum is 47.

The spelling of 21755253584 in words is "twenty-one billion, seven hundred fifty-five million, two hundred fifty-three thousand, five hundred eighty-four".