121552221 has 8 divisors (see below), whose sum is σ = 185222464. Its totient is φ = 69458400.

The previous prime is 121552183. The next prime is 121552241. The reversal of 121552221 is 122255121.

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

It is not a de Polignac number, because 121552221 - 2⁶ = 121552157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 5788201 = 121552221 / (1 + 2 + 1 + 5 + 5 + 2 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121552241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2894080 + ... + 2894121.

It is an arithmetic number, because the mean of its divisors is an integer number (23152808).

Almost surely, 2^121552221 is an apocalyptic number.

It is an amenable number.

121552221 is a deficient number, since it is larger than the sum of its proper divisors (63670243).

121552221 is an equidigital number, since it uses as much as digits as its factorization.

121552221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5788211.

The product of its digits is 400, while the sum is 21.

The square root of 121552221 is about 11025.0723807148. The cubic root of 121552221 is about 495.3600359948.

The spelling of 121552221 in words is "one hundred twenty-one million, five hundred fifty-two thousand, two hundred twenty-one".