15120321432 has 64 divisors (see below), whose sum is σ = 38902636800. Its totient is φ = 4893759360.

The previous prime is 15120321389. The next prime is 15120321451. The reversal of 15120321432 is 23412302151.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 418669 + ... + 453347.

It is an arithmetic number, because the mean of its divisors is an integer number (607853700).

Almost surely, 2^15120321432 is an apocalyptic number.

15120321432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15120321432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19451318400).

15120321432 is an abundant number, since it is smaller than the sum of its proper divisors (23782315368).

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

15120321432 is a wasteful number, since it uses less digits than its factorization.

15120321432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35216 (or 35212 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 15120321432 its reverse (23412302151), we get a palindrome (38532623583).

The spelling of 15120321432 in words is "fifteen billion, one hundred twenty million, three hundred twenty-one thousand, four hundred thirty-two".