121838291 has 4 divisors (see below), whose sum is σ = 127135632. Its totient is φ = 116540952.

The previous prime is 121838287. The next prime is 121838329. The reversal of 121838291 is 192838121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192838121 = 7 ⋅27548303.

It is a cyclic number.

It is not a de Polignac number, because 121838291 - 2² = 121838287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121838261) 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, 2648636 + ... + 2648681.

It is an arithmetic number, because the mean of its divisors is an integer number (31783908).

Almost surely, 2^121838291 is an apocalyptic number.

121838291 is a deficient number, since it is larger than the sum of its proper divisors (5297341).

121838291 is an equidigital number, since it uses as much as digits as its factorization.

121838291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5297340.

The product of its digits is 6912, while the sum is 35.

The square root of 121838291 is about 11038.0383673912. The cubic root of 121838291 is about 495.7483372012.

The spelling of 121838291 in words is "one hundred twenty-one million, eight hundred thirty-eight thousand, two hundred ninety-one".