15221201 has 4 divisors (see below), whose sum is σ = 15746100. Its totient is φ = 14696304.

The previous prime is 15221197. The next prime is 15221203. The reversal of 15221201 is 10212251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8850625 + 6370576 = 2975^2 + 2524^2 .

It is a cyclic number.

It is not a de Polignac number, because 15221201 - 2² = 15221197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15221203) 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, 262406 + ... + 262463.

It is an arithmetic number, because the mean of its divisors is an integer number (3936525).

Almost surely, 2^15221201 is an apocalyptic number.

It is an amenable number.

15221201 is a deficient number, since it is larger than the sum of its proper divisors (524899).

15221201 is an equidigital number, since it uses as much as digits as its factorization.

15221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524898.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 15221201 is about 3901.4357613576. The cubic root of 15221201 is about 247.8275824208.

Adding to 15221201 its reverse (10212251), we get a palindrome (25433452).

The spelling of 15221201 in words is "fifteen million, two hundred twenty-one thousand, two hundred one".