21660157333792 has 48 divisors (see below), whose sum is σ = 42676687402272. Its totient is φ = 10821635136000.

The previous prime is 21660157333769. The next prime is 21660157333799. The reversal of 21660157333792 is 29733375106612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21660157333799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 616957903 + ... + 616993009.

It is an arithmetic number, because the mean of its divisors is an integer number (889097654214).

Almost surely, 2^{21660157333792} is an apocalyptic number.

It is an amenable number.

21660157333792 is a deficient number, since it is larger than the sum of its proper divisors (21016530068480).

21660157333792 is a wasteful number, since it uses less digits than its factorization.

21660157333792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49601 (or 49593 counting only the distinct ones).

The product of its (nonzero) digits is 8573040, while the sum is 55.

The spelling of 21660157333792 in words is "twenty-one trillion, six hundred sixty billion, one hundred fifty-seven million, three hundred thirty-three thousand, seven hundred ninety-two".