15020221 has 2 divisors, whose sum is σ = 15020222. Its totient is φ = 15020220.

The previous prime is 15020207. The next prime is 15020237. The reversal of 15020221 is 12202051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14784025 + 236196 = 3845^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 15020221 - 2⁵ = 15020189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15020251) 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 as a sum of consecutive naturals, namely, 7510110 + 7510111.

It is an arithmetic number, because the mean of its divisors is an integer number (7510111).

Almost surely, 2^15020221 is an apocalyptic number.

It is an amenable number.

15020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15020221 is an equidigital number, since it uses as much as digits as its factorization.

15020221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 15020221 is about 3875.5929868860. The cubic root of 15020221 is about 246.7319782821.

Adding to 15020221 its reverse (12202051), we get a palindrome (27222272).

The spelling of 15020221 in words is "fifteen million, twenty thousand, two hundred twenty-one".