21500157672670 has 48 divisors (see below), whose sum is σ = 41049593186400. Its totient is φ = 8106486049728.

The previous prime is 21500157672647. The next prime is 21500157672683. The reversal of 21500157672670 is 7627675100512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14245737 + ... + 15682516.

It is an arithmetic number, because the mean of its divisors is an integer number (855199858050).

Almost surely, 2^{21500157672670} is an apocalyptic number.

21500157672670 is a deficient number, since it is larger than the sum of its proper divisors (19549435513730).

21500157672670 is a wasteful number, since it uses less digits than its factorization.

21500157672670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29928497 (or 29928478 counting only the distinct ones).

The product of its (nonzero) digits is 1234800, while the sum is 49.

The spelling of 21500157672670 in words is "twenty-one trillion, five hundred billion, one hundred fifty-seven million, six hundred seventy-two thousand, six hundred seventy".