121657223 has 4 divisors (see below), whose sum is σ = 121697400. Its totient is φ = 121617048.

The previous prime is 121657199. The next prime is 121657229. The reversal of 121657223 is 322756121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121657223 - 2²⁰ = 120608647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121657229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15140 + ... + 21737.

It is an arithmetic number, because the mean of its divisors is an integer number (30424350).

Almost surely, 2^121657223 is an apocalyptic number.

121657223 is a deficient number, since it is larger than the sum of its proper divisors (40177).

121657223 is an equidigital number, since it uses as much as digits as its factorization.

121657223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40176.

The product of its digits is 5040, while the sum is 29.

The square root of 121657223 is about 11029.8333169636. The cubic root of 121657223 is about 495.5026326609.

The spelling of 121657223 in words is "one hundred twenty-one million, six hundred fifty-seven thousand, two hundred twenty-three".