15221002112221 has 8 divisors (see below), whose sum is σ = 15266870920224. Its totient is φ = 15175188939120.

The previous prime is 15221002112209. The next prime is 15221002112249. The reversal of 15221002112221 is 12221120012251.

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 15221002112221 - 2⁷ = 15221002112093 is a prime.

It is a super-2 number, since 2×15221002112221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15221002112192 and 15221002112201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15221002112621) 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, 13360695 + ... + 14455108.

It is an arithmetic number, because the mean of its divisors is an integer number (1908358865028).

Almost surely, 2^{15221002112221} is an apocalyptic number.

It is an amenable number.

15221002112221 is a deficient number, since it is larger than the sum of its proper divisors (45868808003).

15221002112221 is a wasteful number, since it uses less digits than its factorization.

15221002112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27817451.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 15221002112221 its reverse (12221120012251), we get a palindrome (27442122124472).

The spelling of 15221002112221 in words is "fifteen trillion, two hundred twenty-one billion, two million, one hundred twelve thousand, two hundred twenty-one".