121814155 has 4 divisors (see below), whose sum is σ = 146176992. Its totient is φ = 97451320.

The previous prime is 121814137. The next prime is 121814167. The reversal of 121814155 is 551418121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551418121 = 223 ⋅2472727.

It is a de Polignac number, because none of the positive numbers 2^k-121814155 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12181411 + ... + 12181420.

It is an arithmetic number, because the mean of its divisors is an integer number (36544248).

Almost surely, 2^121814155 is an apocalyptic number.

121814155 is a deficient number, since it is larger than the sum of its proper divisors (24362837).

121814155 is an equidigital number, since it uses as much as digits as its factorization.

121814155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24362836.

The product of its digits is 1600, while the sum is 28.

The square root of 121814155 is about 11036.9450030341. The cubic root of 121814155 is about 495.7155993486.

The spelling of 121814155 in words is "one hundred twenty-one million, eight hundred fourteen thousand, one hundred fifty-five".