21615470860 has 12 divisors (see below), whose sum is σ = 45392488848. Its totient is φ = 8646188336.

The previous prime is 21615470837. The next prime is 21615470873. The reversal of 21615470860 is 6807451612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540386752 + ... + 540386791.

It is an arithmetic number, because the mean of its divisors is an integer number (3782707404).

Almost surely, 2^21615470860 is an apocalyptic number.

21615470860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21615470860 is an abundant number, since it is smaller than the sum of its proper divisors (23777017988).

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

21615470860 is a wasteful number, since it uses less digits than its factorization.

21615470860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080773552 (or 1080773550 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 21615470860 in words is "twenty-one billion, six hundred fifteen million, four hundred seventy thousand, eight hundred sixty".