15421221200 has 180 divisors, whose sum is σ = 47017071072. Its totient is φ = 4806547200.

The previous prime is 15421221181. The next prime is 15421221209. The reversal of 15421221200 is 212212451.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421221209) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 179837 + ... + 251363.

Almost surely, 2^15421221200 is an apocalyptic number.

15421221200 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 15421221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23508535536).

15421221200 is an abundant number, since it is smaller than the sum of its proper divisors (31595849872).

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

15421221200 is a wasteful number, since it uses less digits than its factorization.

15421221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71570 (or 71552 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 15421221200 its reverse (212212451), we get a palindrome (15633433651).

The spelling of 15421221200 in words is "fifteen billion, four hundred twenty-one million, two hundred twenty-one thousand, two hundred".