21057443776 has 28 divisors (see below), whose sum is σ = 41790480808. Its totient is φ = 10527558912.

The previous prime is 21057443773. The next prime is 21057443783. The reversal of 21057443776 is 67734475012.

It is a super-2 number, since 2×21057443776² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21057443773) 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, 1083295 + ... + 1102561.

Almost surely, 2^21057443776 is an apocalyptic number.

It is an amenable number.

21057443776 is a deficient number, since it is larger than the sum of its proper divisors (20733037032).

21057443776 is a wasteful number, since it uses less digits than its factorization.

21057443776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36356 (or 36346 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 46.

The spelling of 21057443776 in words is "twenty-one billion, fifty-seven million, four hundred forty-three thousand, seven hundred seventy-six".