11922121 has 2 divisors, whose sum is σ = 11922122. Its totient is φ = 11922120.

The previous prime is 11922091. The next prime is 11922193. The reversal of 11922121 is 12122911.

It is a happy number.

It is a m-pointer prime, because the next prime (11922193) can be obtained adding 11922121 to its product of digits (72).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6446521 + 5475600 = 2539^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 11922121 - 2⁵ = 11922089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11922221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5961060 + 5961061.

It is an arithmetic number, because the mean of its divisors is an integer number (5961061).

Almost surely, 2^11922121 is an apocalyptic number.

It is an amenable number.

11922121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11922121 is an equidigital number, since it uses as much as digits as its factorization.

11922121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

The square root of 11922121 is about 3452.8424522413. The cubic root of 11922121 is about 228.4464998672.

The spelling of 11922121 in words is "eleven million, nine hundred twenty-two thousand, one hundred twenty-one".