15221055502221 has 32 divisors (see below), whose sum is σ = 21894913370880. Its totient is φ = 9369874934784.

The previous prime is 15221055502207. The next prime is 15221055502271. The reversal of 15221055502221 is 12220555012251.

It is not a de Polignac number, because 15221055502221 - 2¹⁷ = 15221055371149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15221055502271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72440911 + ... + 72650723.

It is an arithmetic number, because the mean of its divisors is an integer number (684216042840).

Almost surely, 2^{15221055502221} is an apocalyptic number.

It is an amenable number.

15221055502221 is a deficient number, since it is larger than the sum of its proper divisors (6673857868659).

15221055502221 is a wasteful number, since it uses less digits than its factorization.

15221055502221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236725.

The product of its (nonzero) digits is 20000, while the sum is 33.

The spelling of 15221055502221 in words is "fifteen trillion, two hundred twenty-one billion, fifty-five million, five hundred two thousand, two hundred twenty-one".