21463684980 has 48 divisors (see below), whose sum is σ = 60168588480. Its totient is φ = 5716956928.

The previous prime is 21463684967. The next prime is 21463684981. The reversal of 21463684980 is 8948636412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21463684981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157290 + ... + 260129.

It is an arithmetic number, because the mean of its divisors is an integer number (1253512260).

Almost surely, 2^21463684980 is an apocalyptic number.

21463684980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21463684980 is an abundant number, since it is smaller than the sum of its proper divisors (38704903500).

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

21463684980 is a wasteful number, since it uses less digits than its factorization.

21463684980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418288 (or 418286 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 21463684980 in words is "twenty-one billion, four hundred sixty-three million, six hundred eighty-four thousand, nine hundred eighty".