121822261 has 16 divisors (see below), whose sum is σ = 137127168. Its totient is φ = 107272000.

The previous prime is 121822223. The next prime is 121822273. The reversal of 121822261 is 162228121.

It is not a de Polignac number, because 121822261 - 2²³ = 113433653 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 (121822201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51051 + ... + 53383.

It is an arithmetic number, because the mean of its divisors is an integer number (8570448).

Almost surely, 2^121822261 is an apocalyptic number.

121822261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121822261 is a deficient number, since it is larger than the sum of its proper divisors (15304907).

121822261 is a wasteful number, since it uses less digits than its factorization.

121822261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492.

The product of its digits is 768, while the sum is 25.

The square root of 121822261 is about 11037.3122181082. The cubic root of 121822261 is about 495.7265947361.

The spelling of 121822261 in words is "one hundred twenty-one million, eight hundred twenty-two thousand, two hundred sixty-one".