121922817 has 4 divisors (see below), whose sum is σ = 162563760. Its totient is φ = 81281876.

The previous prime is 121922803. The next prime is 121922821. The reversal of 121922817 is 718229121.

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 a cyclic number.

It is not a de Polignac number, because 121922817 - 2²³ = 113534209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121922837) 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, 20320467 + ... + 20320472.

It is an arithmetic number, because the mean of its divisors is an integer number (40640940).

Almost surely, 2^121922817 is an apocalyptic number.

It is an amenable number.

121922817 is a deficient number, since it is larger than the sum of its proper divisors (40640943).

121922817 is an equidigital number, since it uses as much as digits as its factorization.

121922817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40640942.

The product of its digits is 4032, while the sum is 33.

The square root of 121922817 is about 11041.8665541656. The cubic root of 121922817 is about 495.8629534330.

The spelling of 121922817 in words is "one hundred twenty-one million, nine hundred twenty-two thousand, eight hundred seventeen".