15045315221 has 4 divisors (see below), whose sum is σ = 15050576844. Its totient is φ = 15040053600.

The previous prime is 15045315169. The next prime is 15045315227. The reversal of 15045315221 is 12251354051.

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 8814580996 + 6230734225 = 93886^2 + 78935^2 .

It is a cyclic number.

It is not a de Polignac number, because 15045315221 - 2¹⁴ = 15045298837 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 (15045315227) 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, 2626520 + ... + 2632241.

It is an arithmetic number, because the mean of its divisors is an integer number (3762644211).

Almost surely, 2^15045315221 is an apocalyptic number.

It is an amenable number.

15045315221 is a deficient number, since it is larger than the sum of its proper divisors (5261623).

15045315221 is an equidigital number, since it uses as much as digits as its factorization.

15045315221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261622.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 15045315221 its reverse (12251354051), we get a palindrome (27296669272).

The spelling of 15045315221 in words is "fifteen billion, forty-five million, three hundred fifteen thousand, two hundred twenty-one".