21057051124 has 12 divisors (see below), whose sum is σ = 36853295584. Its totient is φ = 10527538104.

The previous prime is 21057051121. The next prime is 21057051137. The reversal of 21057051124 is 42115075012.

It is a junction number, because it is equal to n+sod(n) for n = 21057051092 and 21057051101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21057051121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197802 + ... + 285025.

Almost surely, 2^21057051124 is an apocalyptic number.

It is an amenable number.

21057051124 is a deficient number, since it is larger than the sum of its proper divisors (15796244460).

21057051124 is a wasteful number, since it uses less digits than its factorization.

21057051124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493734 (or 493732 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The spelling of 21057051124 in words is "twenty-one billion, fifty-seven million, fifty-one thousand, one hundred twenty-four".