21920659800 has 96 divisors (see below), whose sum is σ = 73181305680. Its totient is φ = 5395852800.

The previous prime is 21920659793. The next prime is 21920659823. The reversal of 21920659800 is 895602912.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1397371 + ... + 1412970.

Almost surely, 2^21920659800 is an apocalyptic number.

21920659800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21920659800 is an abundant number, since it is smaller than the sum of its proper divisors (51260645880).

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

21920659800 is a wasteful number, since it uses less digits than its factorization.

21920659800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810373 (or 2810364 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 21920659800 in words is "twenty-one billion, nine hundred twenty million, six hundred fifty-nine thousand, eight hundred".