15221461800 has 96 divisors (see below), whose sum is σ = 47218852800. Its totient is φ = 4056276480.

The previous prime is 15221461789. The next prime is 15221461813. The reversal of 15221461800 is 816412251.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 957517 + ... + 973283.

It is an arithmetic number, because the mean of its divisors is an integer number (491863050).

Almost surely, 2^15221461800 is an apocalyptic number.

15221461800 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 15221461800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23609426400).

15221461800 is an abundant number, since it is smaller than the sum of its proper divisors (31997391000).

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

15221461800 is a wasteful number, since it uses less digits than its factorization.

15221461800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17395 (or 17386 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The spelling of 15221461800 in words is "fifteen billion, two hundred twenty-one million, four hundred sixty-one thousand, eight hundred".