121567221 has 12 divisors (see below), whose sum is σ = 185926572. Its totient is φ = 76277376.

The previous prime is 121567211. The next prime is 121567223. The reversal of 121567221 is 122765121.

It can be written as a sum of positive squares in 2 ways, for example, as 112656996 + 8910225 = 10614^2 + 2985^2 .

It is not a de Polignac number, because 121567221 - 2¹⁵ = 121534453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121567223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 397126 + ... + 397431.

It is an arithmetic number, because the mean of its divisors is an integer number (15493881).

Almost surely, 2^121567221 is an apocalyptic number.

It is an amenable number.

121567221 is a deficient number, since it is larger than the sum of its proper divisors (64359351).

121567221 is a wasteful number, since it uses less digits than its factorization.

121567221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794580 (or 794577 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 121567221 is about 11025.7526273720. The cubic root of 121567221 is about 495.3804115855.

The spelling of 121567221 in words is "one hundred twenty-one million, five hundred sixty-seven thousand, two hundred twenty-one".