21657460546 has 4 divisors (see below), whose sum is σ = 32486190822. Its totient is φ = 10828730272.

The previous prime is 21657460499. The next prime is 21657460547. The reversal of 21657460546 is 64506475612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20047444921 + 1610015625 = 141589^2 + 40125^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21657460496 and 21657460505.

It is not an unprimeable number, because it can be changed into a prime (21657460547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5414365135 + ... + 5414365138.

Almost surely, 2^21657460546 is an apocalyptic number.

21657460546 is a deficient number, since it is larger than the sum of its proper divisors (10828730276).

21657460546 is a wasteful number, since it uses less digits than its factorization.

21657460546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10828730275.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 21657460546 in words is "twenty-one billion, six hundred fifty-seven million, four hundred sixty thousand, five hundred forty-six".