15642421032 has 128 divisors (see below), whose sum is σ = 46455091200. Its totient is φ = 4295939328.

The previous prime is 15642421031. The next prime is 15642421063. The reversal of 15642421032 is 23012424651.

It is not an unprimeable number, because it can be changed into a prime (15642421031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500769 + ... + 531087.

It is an arithmetic number, because the mean of its divisors is an integer number (362930400).

Almost surely, 2^15642421032 is an apocalyptic number.

15642421032 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 15642421032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23227545600).

15642421032 is an abundant number, since it is smaller than the sum of its proper divisors (30812670168).

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

15642421032 is a wasteful number, since it uses less digits than its factorization.

15642421032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30455 (or 30451 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 15642421032 its reverse (23012424651), we get a palindrome (38654845683).

The spelling of 15642421032 in words is "fifteen billion, six hundred forty-two million, four hundred twenty-one thousand, thirty-two".