15221155 has 16 divisors (see below), whose sum is σ = 18975744. Its totient is φ = 11708640.

The previous prime is 15221153. The next prime is 15221159. The reversal of 15221155 is 55112251.

It is a happy number.

It is not a de Polignac number, because 15221155 - 2¹ = 15221153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15221153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43692 + ... + 44038.

It is an arithmetic number, because the mean of its divisors is an integer number (1185984).

Almost surely, 2^15221155 is an apocalyptic number.

15221155 is a deficient number, since it is larger than the sum of its proper divisors (3754589).

15221155 is a wasteful number, since it uses less digits than its factorization.

15221155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666.

The product of its digits is 500, while the sum is 22.

The square root of 15221155 is about 3901.4298660876. The cubic root of 15221155 is about 247.8273327673.

It can be divided in two parts, 15221 and 155, that added together give a square (15376 = 124²).

The spelling of 15221155 in words is "fifteen million, two hundred twenty-one thousand, one hundred fifty-five".