121915355 has 4 divisors (see below), whose sum is σ = 146298432. Its totient is φ = 97532280.

The previous prime is 121915351. The next prime is 121915357. The reversal of 121915355 is 553519121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 553519121 = 53 ⋅10443757.

It is not a de Polignac number, because 121915355 - 2² = 121915351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121915351) 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, 12191531 + ... + 12191540.

It is an arithmetic number, because the mean of its divisors is an integer number (36574608).

Almost surely, 2^121915355 is an apocalyptic number.

121915355 is a deficient number, since it is larger than the sum of its proper divisors (24383077).

121915355 is an equidigital number, since it uses as much as digits as its factorization.

121915355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24383076.

The product of its digits is 6750, while the sum is 32.

The square root of 121915355 is about 11041.5286532255. The cubic root of 121915355 is about 495.8528371837.

The spelling of 121915355 in words is "one hundred twenty-one million, nine hundred fifteen thousand, three hundred fifty-five".