15221421200 has 30 divisors (see below), whose sum is σ = 36569465394. Its totient is φ = 6088568320.

The previous prime is 15221421191. The next prime is 15221421203. The reversal of 15221421200 is 212412251.

It can be written as a sum of positive squares in 3 ways, for example, as 1081357456 + 14140063744 = 32884^2 + 118912^2 .

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

It is not an unprimeable number, because it can be changed into a prime (15221421203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19026377 + ... + 19027176.

Almost surely, 2^15221421200 is an apocalyptic number.

15221421200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15221421200 is an abundant number, since it is smaller than the sum of its proper divisors (21348044194).

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

15221421200 is a wasteful number, since it uses less digits than its factorization.

15221421200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38053571 (or 38053560 counting only the distinct ones).

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

Adding to 15221421200 its reverse (212412251), we get a palindrome (15433833451).

The spelling of 15221421200 in words is "fifteen billion, two hundred twenty-one million, four hundred twenty-one thousand, two hundred".