21057763448 has 32 divisors (see below), whose sum is σ = 39807406800. Its totient is φ = 10442750208.

The previous prime is 21057763429. The next prime is 21057763453. The reversal of 21057763448 is 84436775012.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561740 + ... + 598052.

Almost surely, 2^21057763448 is an apocalyptic number.

It is an amenable number.

21057763448 is a deficient number, since it is larger than the sum of its proper divisors (18749643352).

21057763448 is a wasteful number, since it uses less digits than its factorization.

21057763448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36911 (or 36907 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 47.

The spelling of 21057763448 in words is "twenty-one billion, fifty-seven million, seven hundred sixty-three thousand, four hundred forty-eight".