15421043320 has 128 divisors (see below), whose sum is σ = 35769600000. Its totient is φ = 5981893632.

The previous prime is 15421043291. The next prime is 15421043327. The reversal of 15421043320 is 2334012451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421043327) 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, 77492581 + ... + 77492779.

It is an arithmetic number, because the mean of its divisors is an integer number (279450000).

Almost surely, 2^15421043320 is an apocalyptic number.

15421043320 is a gapful number since it is divisible by the number (10) 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 15421043320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17884800000).

15421043320 is an abundant number, since it is smaller than the sum of its proper divisors (20348556680).

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

15421043320 is a wasteful number, since it uses less digits than its factorization.

15421043320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 15421043320 its reverse (2334012451), we get a palindrome (17755055771).

The spelling of 15421043320 in words is "fifteen billion, four hundred twenty-one million, forty-three thousand, three hundred twenty".