121922779 has 4 divisors (see below), whose sum is σ = 133006680. Its totient is φ = 110838880.

The previous prime is 121922777. The next prime is 121922789. The reversal of 121922779 is 977229121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121922779 - 2¹ = 121922777 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121922777) 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, 5541934 + ... + 5541955.

It is an arithmetic number, because the mean of its divisors is an integer number (33251670).

Almost surely, 2^121922779 is an apocalyptic number.

121922779 is a deficient number, since it is larger than the sum of its proper divisors (11083901).

121922779 is a wasteful number, since it uses less digits than its factorization.

121922779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11083900.

The product of its digits is 31752, while the sum is 40.

The square root of 121922779 is about 11041.8648334419. The cubic root of 121922779 is about 495.8629019174.

The spelling of 121922779 in words is "one hundred twenty-one million, nine hundred twenty-two thousand, seven hundred seventy-nine".