15221502420 has 24 divisors (see below), whose sum is σ = 42620206944. Its totient is φ = 4059067296.

The previous prime is 15221502403. The next prime is 15221502451. The reversal of 15221502420 is 2420512251.

15221502420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126845794 + ... + 126845913.

It is an arithmetic number, because the mean of its divisors is an integer number (1775841956).

Almost surely, 2^15221502420 is an apocalyptic number.

15221502420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15221502420 is an abundant number, since it is smaller than the sum of its proper divisors (27398704524).

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

15221502420 is a wasteful number, since it uses less digits than its factorization.

15221502420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253691719 (or 253691717 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The spelling of 15221502420 in words is "fifteen billion, two hundred twenty-one million, five hundred two thousand, four hundred twenty".