21931152798 has 16 divisors (see below), whose sum is σ = 43869442176. Its totient is φ = 7309194840.

The previous prime is 21931152769. The next prime is 21931152811. The reversal of 21931152798 is 89725113912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256986 + ... + 331517.

It is an arithmetic number, because the mean of its divisors is an integer number (2741840136).

Almost surely, 2^21931152798 is an apocalyptic number.

21931152798 is an abundant number, since it is smaller than the sum of its proper divisors (21938289378).

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

21931152798 is a wasteful number, since it uses less digits than its factorization.

21931152798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594719.

The product of its digits is 272160, while the sum is 48.

The spelling of 21931152798 in words is "twenty-one billion, nine hundred thirty-one million, one hundred fifty-two thousand, seven hundred ninety-eight".