21757513744 has 40 divisors (see below), whose sum is σ = 43335623168. Its totient is φ = 10574686080.

The previous prime is 21757513741. The next prime is 21757513759. The reversal of 21757513744 is 44731575712.

It is a junction number, because it is equal to n+sod(n) for n = 21757513694 and 21757513703.

It is not an unprimeable number, because it can be changed into a prime (21757513741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626599 + ... + 660409.

Almost surely, 2^21757513744 is an apocalyptic number.

It is an amenable number.

21757513744 is a deficient number, since it is larger than the sum of its proper divisors (21578109424).

21757513744 is a wasteful number, since it uses less digits than its factorization.

21757513744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34943 (or 34937 counting only the distinct ones).

The product of its digits is 823200, while the sum is 46.

The spelling of 21757513744 in words is "twenty-one billion, seven hundred fifty-seven million, five hundred thirteen thousand, seven hundred forty-four".