15422221 has 4 divisors (see below), whose sum is σ = 15919744. Its totient is φ = 14924700.

The previous prime is 15422219. The next prime is 15422233. The reversal of 15422221 is 12222451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12222451 = 709 ⋅17239.

It is a cyclic number.

It is not a de Polignac number, because 15422221 - 2¹ = 15422219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15422021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248715 + ... + 248776.

It is an arithmetic number, because the mean of its divisors is an integer number (3979936).

Almost surely, 2^15422221 is an apocalyptic number.

It is an amenable number.

15422221 is a deficient number, since it is larger than the sum of its proper divisors (497523).

15422221 is an equidigital number, since it uses as much as digits as its factorization.

15422221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497522.

The product of its digits is 320, while the sum is 19.

The square root of 15422221 is about 3927.1135710595. The cubic root of 15422221 is about 248.9137995088.

Adding to 15422221 its reverse (12222451), we get a palindrome (27644672).

The spelling of 15422221 in words is "fifteen million, four hundred twenty-two thousand, two hundred twenty-one".