21913502688 has 216 divisors, whose sum is σ = 78282784944. Its totient is φ = 5691755520.

The previous prime is 21913502627. The next prime is 21913502711. The reversal of 21913502688 is 88620531912.

21913502688 is a `hidden beast` number, since 219 + 1 + 350 + 2 + 6 + 88 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 199020 + ... + 288852.

Almost surely, 2^21913502688 is an apocalyptic number.

21913502688 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 21913502688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39141392472).

21913502688 is an abundant number, since it is smaller than the sum of its proper divisors (56369282256).

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

21913502688 is a wasteful number, since it uses less digits than its factorization.

21913502688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89878 (or 89856 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 21913502688 in words is "twenty-one billion, nine hundred thirteen million, five hundred two thousand, six hundred eighty-eight".