21197239576 has 16 divisors (see below), whose sum is σ = 41472860400. Its totient is φ = 10137810144.

The previous prime is 21197239529. The next prime is 21197239577. The reversal of 21197239576 is 67593279112.

It is a super-3 number, since 3×21197239576³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21197239577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57601011 + ... + 57601378.

It is an arithmetic number, because the mean of its divisors is an integer number (2592053775).

Almost surely, 2^21197239576 is an apocalyptic number.

It is an amenable number.

21197239576 is a deficient number, since it is larger than the sum of its proper divisors (20275620824).

21197239576 is a wasteful number, since it uses less digits than its factorization.

21197239576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115202418 (or 115202414 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 52.

The spelling of 21197239576 in words is "twenty-one billion, one hundred ninety-seven million, two hundred thirty-nine thousand, five hundred seventy-six".