121152221 has 4 divisors (see below), whose sum is σ = 121681500. Its totient is φ = 120622944.

The previous prime is 121152211. The next prime is 121152233. The reversal of 121152221 is 122251121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80371225 + 40780996 = 8965^2 + 6386^2 .

It is a cyclic number.

It is not a de Polignac number, because 121152221 - 2¹⁴ = 121135837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121152221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121152211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264296 + ... + 264753.

It is an arithmetic number, because the mean of its divisors is an integer number (30420375).

Almost surely, 2^121152221 is an apocalyptic number.

It is an amenable number.

121152221 is a deficient number, since it is larger than the sum of its proper divisors (529279).

121152221 is an equidigital number, since it uses as much as digits as its factorization.

121152221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529278.

The product of its digits is 80, while the sum is 17.

The square root of 121152221 is about 11006.9169616201. The cubic root of 121152221 is about 494.8160674311.

The spelling of 121152221 in words is "one hundred twenty-one million, one hundred fifty-two thousand, two hundred twenty-one".