121590921 has 8 divisors (see below), whose sum is σ = 162321984. Its totient is φ = 80960240.

The previous prime is 121590907. The next prime is 121590923. The reversal of 121590921 is 129095121.

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

It is a cyclic number.

It is not a de Polignac number, because 121590921 - 2⁷ = 121590793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121590923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22221 + ... + 27146.

It is an arithmetic number, because the mean of its divisors is an integer number (20290248).

Almost surely, 2^121590921 is an apocalyptic number.

It is an amenable number.

121590921 is a deficient number, since it is larger than the sum of its proper divisors (40731063).

121590921 is an equidigital number, since it uses as much as digits as its factorization.

121590921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50191.

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 121590921 is about 11026.8273315582. The cubic root of 121590921 is about 495.4126016029.

The spelling of 121590921 in words is "one hundred twenty-one million, five hundred ninety thousand, nine hundred twenty-one".