21572157930 has 32 divisors (see below), whose sum is σ = 54024188544. Its totient is φ = 5502463296.

The previous prime is 21572157869. The next prime is 21572157979. The reversal of 21572157930 is 3975127512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15631309 + ... + 15632688.

It is an arithmetic number, because the mean of its divisors is an integer number (1688255892).

Almost surely, 2^21572157930 is an apocalyptic number.

21572157930 is an abundant number, since it is smaller than the sum of its proper divisors (32452030614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21572157930 is a wasteful number, since it uses less digits than its factorization.

21572157930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31264030.

The product of its (nonzero) digits is 132300, while the sum is 42.

The spelling of 21572157930 in words is "twenty-one billion, five hundred seventy-two million, one hundred fifty-seven thousand, nine hundred thirty".