22102121 has 2 divisors, whose sum is σ = 22102122. Its totient is φ = 22102120.

The previous prime is 22102117. The next prime is 22102139. The reversal of 22102121 is 12120122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20976400 + 1125721 = 4580^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102121 - 2² = 22102117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22102151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11051060 + 11051061.

It is an arithmetic number, because the mean of its divisors is an integer number (11051061).

Almost surely, 2^22102121 is an apocalyptic number.

It is an amenable number.

22102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22102121 is an equidigital number, since it uses as much as digits as its factorization.

22102121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 22102121 is about 4701.2892912477. The cubic root of 22102121 is about 280.6368201032.

Adding to 22102121 its reverse (12120122), we get a palindrome (34222243).

The spelling of 22102121 in words is "twenty-two million, one hundred two thousand, one hundred twenty-one".