15374221 has 4 divisors (see below), whose sum is σ = 15749244. Its totient is φ = 14999200.

The previous prime is 15374213. The next prime is 15374231. The reversal of 15374221 is 12247351.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12247351 = 2551 ⋅4801.

It can be written as a sum of positive squares in 2 ways, for example, as 3222025 + 12152196 = 1795^2 + 3486^2 .

It is a cyclic number.

It is not a de Polignac number, because 15374221 - 2³ = 15374213 is a prime.

It is a super-3 number, since 3×15374221³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15374231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187450 + ... + 187531.

It is an arithmetic number, because the mean of its divisors is an integer number (3937311).

Almost surely, 2^15374221 is an apocalyptic number.

It is an amenable number.

15374221 is a deficient number, since it is larger than the sum of its proper divisors (375023).

15374221 is an equidigital number, since it uses as much as digits as its factorization.

15374221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375022.

The product of its digits is 1680, while the sum is 25.

The square root of 15374221 is about 3920.9974496294. The cubic root of 15374221 is about 248.6552920100.

The spelling of 15374221 in words is "fifteen million, three hundred seventy-four thousand, two hundred twenty-one".