21999584516 has 24 divisors (see below), whose sum is σ = 47383721280. Its totient is φ = 8703132192.

The previous prime is 21999584489. The next prime is 21999584531. The reversal of 21999584516 is 61548599912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30218846 + ... + 30219573.

It is an arithmetic number, because the mean of its divisors is an integer number (1974321720).

Almost surely, 2^21999584516 is an apocalyptic number.

21999584516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21999584516 is an abundant number, since it is smaller than the sum of its proper divisors (25384136764).

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

21999584516 is a wasteful number, since it uses less digits than its factorization.

21999584516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60438443 (or 60438441 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 59.

The spelling of 21999584516 in words is "twenty-one billion, nine hundred ninety-nine million, five hundred eighty-four thousand, five hundred sixteen".