15221272 has 16 divisors (see below), whose sum is σ = 31134600. Its totient is φ = 6918720.

The previous prime is 15221263. The next prime is 15221281. The reversal of 15221272 is 27212251.

It is an interprime number because it is at equal distance from previous prime (15221263) and next prime (15221281).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86397 + ... + 86572.

Almost surely, 2^15221272 is an apocalyptic number.

It is an amenable number.

15221272 is an abundant number, since it is smaller than the sum of its proper divisors (15913328).

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

15221272 is a wasteful number, since it uses less digits than its factorization.

15221272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172986 (or 172982 counting only the distinct ones).

The product of its digits is 560, while the sum is 22.

The square root of 15221272 is about 3901.4448605613. Note that the first 3 decimals coincide. The cubic root of 15221272 is about 247.8279677546.

The spelling of 15221272 in words is "fifteen million, two hundred twenty-one thousand, two hundred seventy-two".