21697176088 has 96 divisors (see below), whose sum is σ = 47820628800. Its totient is φ = 9201729600.

The previous prime is 21697176079. The next prime is 21697176133. The reversal of 21697176088 is 88067179612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26753203 + ... + 26754013.

It is an arithmetic number, because the mean of its divisors is an integer number (498131550).

Almost surely, 2^21697176088 is an apocalyptic number.

21697176088 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21697176088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23910314400).

21697176088 is an abundant number, since it is smaller than the sum of its proper divisors (26123452712).

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

21697176088 is a wasteful number, since it uses less digits than its factorization.

21697176088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461 (or 1450 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 21697176088 in words is "twenty-one billion, six hundred ninety-seven million, one hundred seventy-six thousand, eighty-eight".