121890117 has 4 divisors (see below), whose sum is σ = 162520160. Its totient is φ = 81260076.

The previous prime is 121890113. The next prime is 121890137. The reversal of 121890117 is 711098121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121890117 - 2² = 121890113 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 (121890113) 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, 20315017 + ... + 20315022.

It is an arithmetic number, because the mean of its divisors is an integer number (40630040).

Almost surely, 2^121890117 is an apocalyptic number.

It is an amenable number.

121890117 is a deficient number, since it is larger than the sum of its proper divisors (40630043).

121890117 is an equidigital number, since it uses as much as digits as its factorization.

121890117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40630042.

The product of its (nonzero) digits is 1008, while the sum is 30.

The square root of 121890117 is about 11040.3857269572. The cubic root of 121890117 is about 495.8186189138.

The spelling of 121890117 in words is "one hundred twenty-one million, eight hundred ninety thousand, one hundred seventeen".