21980994980 has 48 divisors (see below), whose sum is σ = 53619234816. Its totient is φ = 7412791680.

The previous prime is 21980994923. The next prime is 21980994991. The reversal of 21980994980 is 8949908912.

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, 1278404 + ... + 1295483.

It is an arithmetic number, because the mean of its divisors is an integer number (1117067392).

Almost surely, 2^21980994980 is an apocalyptic number.

21980994980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21980994980 is an abundant number, since it is smaller than the sum of its proper divisors (31638239836).

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

21980994980 is a wasteful number, since it uses less digits than its factorization.

21980994980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573964 (or 2573962 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 59.

The spelling of 21980994980 in words is "twenty-one billion, nine hundred eighty million, nine hundred ninety-four thousand, nine hundred eighty".