15221265 has 16 divisors (see below), whose sum is σ = 24494400. Its totient is φ = 8071232.

The previous prime is 15221263. The next prime is 15221281. The reversal of 15221265 is 56212251.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 15221265 - 2¹ = 15221263 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (15221263) 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, 150 + ... + 5519.

It is an arithmetic number, because the mean of its divisors is an integer number (1530900).

Almost surely, 2^15221265 is an apocalyptic number.

15221265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15221265 is a deficient number, since it is larger than the sum of its proper divisors (9273135).

15221265 is a wasteful number, since it uses less digits than its factorization.

15221265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856.

The product of its digits is 1200, while the sum is 24.

The square root of 15221265 is about 3901.4439634576. The cubic root of 15221265 is about 247.8279297640.

The spelling of 15221265 in words is "fifteen million, two hundred twenty-one thousand, two hundred sixty-five".