15221055 has 16 divisors (see below), whose sum is σ = 25413120. Its totient is φ = 7764768.

The previous prime is 15221053. The next prime is 15221083. The reversal of 15221055 is 55012251.

15221055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15221055 - 2¹ = 15221053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15221053) 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, 21715 + ... + 22404.

It is an arithmetic number, because the mean of its divisors is an integer number (1588320).

Almost surely, 2^15221055 is an apocalyptic number.

15221055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15221055 is a deficient number, since it is larger than the sum of its proper divisors (10192065).

15221055 is a wasteful number, since it uses less digits than its factorization.

15221055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44150.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 15221055 is about 3901.4170502524. The cubic root of 15221055 is about 247.8267900404.

The spelling of 15221055 in words is "fifteen million, two hundred twenty-one thousand, fifty-five".