21572588396 has 24 divisors (see below), whose sum is σ = 40101306336. Its totient is φ = 10119153920.

The previous prime is 21572588393. The next prime is 21572588431. The reversal of 21572588396 is 69388527512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21572588393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488891 + ... + 531186.

It is an arithmetic number, because the mean of its divisors is an integer number (1670887764).

Almost surely, 2^21572588396 is an apocalyptic number.

It is an amenable number.

21572588396 is a deficient number, since it is larger than the sum of its proper divisors (18528717940).

21572588396 is a wasteful number, since it uses less digits than its factorization.

21572588396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020409 (or 1020407 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 56.

The spelling of 21572588396 in words is "twenty-one billion, five hundred seventy-two million, five hundred eighty-eight thousand, three hundred ninety-six".