15104636221 has 4 divisors (see below), whose sum is σ = 15993144252. Its totient is φ = 14216128192.

The previous prime is 15104636191. The next prime is 15104636231. The reversal of 15104636221 is 12263640151.

It is a happy number.

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 11953048900 + 3151587321 = 109330^2 + 56139^2 .

It is a cyclic number.

It is not a de Polignac number, because 15104636221 - 2⁵ = 15104636189 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 (15104636231) 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, 444253990 + ... + 444254023.

It is an arithmetic number, because the mean of its divisors is an integer number (3998286063).

Almost surely, 2^15104636221 is an apocalyptic number.

It is an amenable number.

15104636221 is a deficient number, since it is larger than the sum of its proper divisors (888508031).

15104636221 is an equidigital number, since it uses as much as digits as its factorization.

15104636221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888508030.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 15104636221 in words is "fifteen billion, one hundred four million, six hundred thirty-six thousand, two hundred twenty-one".