21857743635 has 32 divisors (see below), whose sum is σ = 43042944000. Its totient is φ = 9223486848.

The previous prime is 21857743547. The next prime is 21857743657. The reversal of 21857743635 is 53634775812.

It is not a de Polignac number, because 21857743635 - 2⁸ = 21857743379 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8005135 + ... + 8007864.

It is an arithmetic number, because the mean of its divisors is an integer number (1345092000).

Almost surely, 2^21857743635 is an apocalyptic number.

21857743635 is a deficient number, since it is larger than the sum of its proper divisors (21185200365).

21857743635 is a wasteful number, since it uses less digits than its factorization.

21857743635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16013027.

The product of its digits is 4233600, while the sum is 51.

The spelling of 21857743635 in words is "twenty-one billion, eight hundred fifty-seven million, seven hundred forty-three thousand, six hundred thirty-five".