15721428130 has 32 divisors (see below), whose sum is σ = 30454412400. Its totient is φ = 5821624320.

The previous prime is 15721428103. The next prime is 15721428197. The reversal of 15721428130 is 3182412751.

It can be written as a sum of positive squares in 8 ways, for example, as 5747610969 + 9973817161 = 75813^2 + 99869^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

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, 747655 + ... + 768394.

Almost surely, 2^15721428130 is an apocalyptic number.

15721428130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15721428130 is a deficient number, since it is larger than the sum of its proper divisors (14732984270).

15721428130 is a wasteful number, since it uses less digits than its factorization.

15721428130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516134.

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 15721428130 in words is "fifteen billion, seven hundred twenty-one million, four hundred twenty-eight thousand, one hundred thirty".