21539874628 has 12 divisors (see below), whose sum is σ = 39678716560. Its totient is φ = 10203098472.

The previous prime is 21539874557. The next prime is 21539874649. The reversal of 21539874628 is 82647893512.

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, 141709626 + ... + 141709777.

Almost surely, 2^21539874628 is an apocalyptic number.

It is an amenable number.

21539874628 is a deficient number, since it is larger than the sum of its proper divisors (18138841932).

21539874628 is a wasteful number, since it uses less digits than its factorization.

21539874628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283419426 (or 283419424 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 21539874628 in words is "twenty-one billion, five hundred thirty-nine million, eight hundred seventy-four thousand, six hundred twenty-eight".