21489642551196 has 72 divisors (see below), whose sum is σ = 57285737272400. Its totient is φ = 6773658981120.

The previous prime is 21489642551183. The next prime is 21489642551207. The reversal of 21489642551196 is 69115524698412.

It is a happy number.

21489642551196 is a `hidden beast` number, since 2 + 1 + 4 + 8 + 9 + 6 + 4 + 25 + 511 + 96 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28666561 + ... + 29406648.

Almost surely, 2^{21489642551196} is an apocalyptic number.

It is an amenable number.

21489642551196 is an abundant number, since it is smaller than the sum of its proper divisors (35796094721204).

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

21489642551196 is a wasteful number, since it uses less digits than its factorization.

21489642551196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58073779 (or 58073774 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 63.

The spelling of 21489642551196 in words is "twenty-one trillion, four hundred eighty-nine billion, six hundred forty-two million, five hundred fifty-one thousand, one hundred ninety-six".