21657340604 has 48 divisors (see below), whose sum is σ = 40921977600. Its totient is φ = 9990829056.

The previous prime is 21657340577. The next prime is 21657340609. The reversal of 21657340604 is 40604375612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21657340609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6445877 + ... + 6449235.

It is an arithmetic number, because the mean of its divisors is an integer number (852541200).

Almost surely, 2^21657340604 is an apocalyptic number.

It is an amenable number.

21657340604 is a deficient number, since it is larger than the sum of its proper divisors (19264636996).

21657340604 is a wasteful number, since it uses less digits than its factorization.

21657340604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5222 (or 5220 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 21657340604 in words is "twenty-one billion, six hundred fifty-seven million, three hundred forty thousand, six hundred four".