21858957892 has 24 divisors (see below), whose sum is σ = 40926616640. Its totient is φ = 10184499360.

The previous prime is 21858957889. The next prime is 21858957893. The reversal of 21858957892 is 29875985812.

It is a super-3 number, since 3×21858957892³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21858957893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2352888 + ... + 2362159.

Almost surely, 2^21858957892 is an apocalyptic number.

It is an amenable number.

21858957892 is a deficient number, since it is larger than the sum of its proper divisors (19067658748).

21858957892 is a wasteful number, since it uses less digits than its factorization.

21858957892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4715131 (or 4715129 counting only the distinct ones).

The product of its digits is 29030400, while the sum is 64.

The spelling of 21858957892 in words is "twenty-one billion, eight hundred fifty-eight million, nine hundred fifty-seven thousand, eight hundred ninety-two".