15112421253221 has 8 divisors (see below), whose sum is σ = 15634738234080. Its totient is φ = 14590184206192.

The previous prime is 15112421253203. The next prime is 15112421253229. The reversal of 15112421253221 is 12235212421151.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15112421253221 - 2¹⁰ = 15112421252197 is a prime.

It is a super-4 number, since 4×15112421253221⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15112421253229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19598675 + ... + 20355168.

It is an arithmetic number, because the mean of its divisors is an integer number (1954342279260).

Almost surely, 2^{15112421253221} is an apocalyptic number.

It is an amenable number.

15112421253221 is a deficient number, since it is larger than the sum of its proper divisors (522316980859).

15112421253221 is a wasteful number, since it uses less digits than its factorization.

15112421253221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39966915.

The product of its digits is 9600, while the sum is 32.

Adding to 15112421253221 its reverse (12235212421151), we get a palindrome (27347633674372).

The spelling of 15112421253221 in words is "fifteen trillion, one hundred twelve billion, four hundred twenty-one million, two hundred fifty-three thousand, two hundred twenty-one".