21188699580 has 48 divisors (see below), whose sum is σ = 59391833760. Its totient is φ = 5644274688.

The previous prime is 21188699579. The next prime is 21188699593. The reversal of 21188699580 is 8599688112.

It is a self number, because there is not a number n which added to its sum of digits gives 21188699580.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132225 + ... + 244664.

It is an arithmetic number, because the mean of its divisors is an integer number (1237329870).

Almost surely, 2^21188699580 is an apocalyptic number.

21188699580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21188699580 is an abundant number, since it is smaller than the sum of its proper divisors (38203134180).

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

21188699580 is a wasteful number, since it uses less digits than its factorization.

21188699580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377838 (or 377836 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 57.

The spelling of 21188699580 in words is "twenty-one billion, one hundred eighty-eight million, six hundred ninety-nine thousand, five hundred eighty".