15221451400 has 96 divisors (see below), whose sum is σ = 35917344000. Its totient is φ = 5998187520.

The previous prime is 15221451397. The next prime is 15221451403. The reversal of 15221451400 is 415412251.

It is an interprime number because it is at equal distance from previous prime (15221451397) and next prime (15221451403).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (15221451403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10221856 + ... + 10223344.

It is an arithmetic number, because the mean of its divisors is an integer number (374139000).

Almost surely, 2^15221451400 is an apocalyptic number.

15221451400 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 15221451400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17958672000).

15221451400 is an abundant number, since it is smaller than the sum of its proper divisors (20695892600).

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

15221451400 is a wasteful number, since it uses less digits than its factorization.

15221451400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231 (or 2222 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 15221451400 its reverse (415412251), we get a palindrome (15636863651).

The spelling of 15221451400 in words is "fifteen billion, two hundred twenty-one million, four hundred fifty-one thousand, four hundred".