21982398220 has 48 divisors (see below), whose sum is σ = 47670287616. Its totient is φ = 8506080000.

The previous prime is 21982398203. The next prime is 21982398241. The reversal of 21982398220 is 2289328912.

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, 2215270 + ... + 2225170.

It is an arithmetic number, because the mean of its divisors is an integer number (993130992).

Almost surely, 2^21982398220 is an apocalyptic number.

21982398220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21982398220 is an abundant number, since it is smaller than the sum of its proper divisors (25687889396).

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

21982398220 is a wasteful number, since it uses less digits than its factorization.

21982398220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13522 (or 13520 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 21982398220 in words is "twenty-one billion, nine hundred eighty-two million, three hundred ninety-eight thousand, two hundred twenty".