21958203680 has 96 divisors (see below), whose sum is σ = 62774683776. Its totient is φ = 7085666304.

The previous prime is 21958203671. The next prime is 21958203739. The reversal of 21958203680 is 8630285912.

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, 557594 + ... + 595673.

It is an arithmetic number, because the mean of its divisors is an integer number (653902956).

Almost surely, 2^21958203680 is an apocalyptic number.

21958203680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21958203680 is an abundant number, since it is smaller than the sum of its proper divisors (40816480096).

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

21958203680 is a wasteful number, since it uses less digits than its factorization.

21958203680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153306 (or 1153298 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 21958203680 in words is "twenty-one billion, nine hundred fifty-eight million, two hundred three thousand, six hundred eighty".