15251221125 has 96 divisors (see below), whose sum is σ = 32434501632. Its totient is φ = 6746976000.

The previous prime is 15251221109. The next prime is 15251221129. The reversal of 15251221125 is 52112215251.

15251221125 is a `hidden beast` number, since 1 + 5 + 2 + 512 + 21 + 125 = 666.

It is not a de Polignac number, because 15251221125 - 2⁴ = 15251221109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15251221129) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 212889 + ... + 275361.

It is an arithmetic number, because the mean of its divisors is an integer number (337859392).

Almost surely, 2^15251221125 is an apocalyptic number.

15251221125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15251221125 is an abundant number, since it is smaller than the sum of its proper divisors (17183280507).

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

15251221125 is a wasteful number, since it uses less digits than its factorization.

15251221125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62532 (or 62519 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

Adding to 15251221125 its reverse (52112215251), we get a palindrome (67363436376).

The spelling of 15251221125 in words is "fifteen billion, two hundred fifty-one million, two hundred twenty-one thousand, one hundred twenty-five".