15221204145 has 48 divisors (see below), whose sum is σ = 30333139200. Its totient is φ = 6916574592.

The previous prime is 15221204111. The next prime is 15221204153. The reversal of 15221204145 is 54140212251.

It is a happy number.

15221204145 is a `hidden beast` number, since 1 + 5 + 221 + 20 + 414 + 5 = 666.

It is not a de Polignac number, because 15221204145 - 2⁶ = 15221204081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92070 + ... + 197279.

It is an arithmetic number, because the mean of its divisors is an integer number (631940400).

Almost surely, 2^15221204145 is an apocalyptic number.

15221204145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15221204145 is a deficient number, since it is larger than the sum of its proper divisors (15111935055).

15221204145 is a wasteful number, since it uses less digits than its factorization.

15221204145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289534 (or 289531 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 15221204145 its reverse (54140212251), we get a palindrome (69361416396).

The spelling of 15221204145 in words is "fifteen billion, two hundred twenty-one million, two hundred four thousand, one hundred forty-five".