21660157333790 has 32 divisors (see below), whose sum is σ = 40454824987584. Its totient is φ = 8342992880640.

The previous prime is 21660157333769. The next prime is 21660157333799. The reversal of 21660157333790 is 9733375106612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660157333799) 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, 301721666 + ... + 301793445.

It is an arithmetic number, because the mean of its divisors is an integer number (1264213280862).

Almost surely, 2^{21660157333790} is an apocalyptic number.

21660157333790 is a deficient number, since it is larger than the sum of its proper divisors (18794667653794).

21660157333790 is a wasteful number, since it uses less digits than its factorization.

21660157333790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603515252.

The product of its (nonzero) digits is 4286520, while the sum is 53.

The spelling of 21660157333790 in words is "twenty-one trillion, six hundred sixty billion, one hundred fifty-seven million, three hundred thirty-three thousand, seven hundred ninety".