15016157221 has 4 divisors (see below), whose sum is σ = 16171246252. Its totient is φ = 13861068192.

The previous prime is 15016157207. The next prime is 15016157263. The reversal of 15016157221 is 12275161051.

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 2447280900 + 12568876321 = 49470^2 + 112111^2 .

It is a cyclic number.

It is not a de Polignac number, because 15016157221 - 2⁹ = 15016156709 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 (15016157521) 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, 577544496 + ... + 577544521.

It is an arithmetic number, because the mean of its divisors is an integer number (4042811563).

Almost surely, 2^15016157221 is an apocalyptic number.

It is an amenable number.

15016157221 is a deficient number, since it is larger than the sum of its proper divisors (1155089031).

15016157221 is a wasteful number, since it uses less digits than its factorization.

15016157221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155089030.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 15016157221 in words is "fifteen billion, sixteen million, one hundred fifty-seven thousand, two hundred twenty-one".