15221233230221 has 16 divisors (see below), whose sum is σ = 15686517103488. Its totient is φ = 14760434745600.

The previous prime is 15221233230187. The next prime is 15221233230239. The reversal of 15221233230221 is 12203233212251.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-15221233230221 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 (15221233230241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307891721 + ... + 307941153.

It is an arithmetic number, because the mean of its divisors is an integer number (980407318968).

Almost surely, 2^{15221233230221} is an apocalyptic number.

It is an amenable number.

15221233230221 is a deficient number, since it is larger than the sum of its proper divisors (465283873267).

15221233230221 is a wasteful number, since it uses less digits than its factorization.

15221233230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94612.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 15221233230221 its reverse (12203233212251), we get a palindrome (27424466442472).

The spelling of 15221233230221 in words is "fifteen trillion, two hundred twenty-one billion, two hundred thirty-three million, two hundred thirty thousand, two hundred twenty-one".