21900992688 has 60 divisors (see below), whose sum is σ = 61562463768. Its totient is φ = 7268160000.

The previous prime is 21900992683. The next prime is 21900992699. The reversal of 21900992688 is 88629900912.

It is not an unprimeable number, because it can be changed into a prime (21900992683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302313 + ... + 367688.

Almost surely, 2^21900992688 is an apocalyptic number.

It is an amenable number.

21900992688 is an abundant number, since it is smaller than the sum of its proper divisors (39661471080).

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

21900992688 is a wasteful number, since it uses less digits than its factorization.

21900992688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670242 (or 670233 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 21900992688 in words is "twenty-one billion, nine hundred million, nine hundred ninety-two thousand, six hundred eighty-eight".