21576345356 has 24 divisors (see below), whose sum is σ = 41473985280. Its totient is φ = 9776009232.

The previous prime is 21576345347. The next prime is 21576345367. The reversal of 21576345356 is 65354367512.

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 self number, because there is not a number n which added to its sum of digits gives 21576345356.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6169976 + ... + 6173471.

It is an arithmetic number, because the mean of its divisors is an integer number (1728082720).

Almost surely, 2^21576345356 is an apocalyptic number.

It is an amenable number.

21576345356 is a deficient number, since it is larger than the sum of its proper divisors (19897639924).

21576345356 is a wasteful number, since it uses less digits than its factorization.

21576345356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12343493 (or 12343491 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 47.

The spelling of 21576345356 in words is "twenty-one billion, five hundred seventy-six million, three hundred forty-five thousand, three hundred fifty-six".