21660157333772 has 24 divisors (see below), whose sum is σ = 37917453109536. Its totient is φ = 10826599771008.

The previous prime is 21660157333769. The next prime is 21660157333799. The reversal of 21660157333772 is 27733375106612.

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, 215832518 + ... + 215932850.

It is an arithmetic number, because the mean of its divisors is an integer number (1579893879564).

Almost surely, 2^{21660157333772} is an apocalyptic number.

It is an amenable number.

21660157333772 is a deficient number, since it is larger than the sum of its proper divisors (16257295775764).

21660157333772 is a wasteful number, since it uses less digits than its factorization.

21660157333772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117137 (or 117135 counting only the distinct ones).

The product of its (nonzero) digits is 6667920, while the sum is 53.

The spelling of 21660157333772 in words is "twenty-one trillion, six hundred sixty billion, one hundred fifty-seven million, three hundred thirty-three thousand, seven hundred seventy-two".