22002121 has 2 divisors, whose sum is σ = 22002122. Its totient is φ = 22002120.

The previous prime is 22002107. The next prime is 22002163. The reversal of 22002121 is 12120022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21344400 + 657721 = 4620^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 22002121 - 2¹⁷ = 21871049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22002098 and 22002107.

It is not a weakly prime, because it can be changed into another prime (22006121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11001060 + 11001061.

It is an arithmetic number, because the mean of its divisors is an integer number (11001061).

Almost surely, 2^22002121 is an apocalyptic number.

It is an amenable number.

22002121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22002121 is an equidigital number, since it uses as much as digits as its factorization.

22002121 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 10.

The square root of 22002121 is about 4690.6418537339. The cubic root of 22002121 is about 280.2129375117.

Adding to 22002121 its reverse (12120022), we get a palindrome (34122143).

The spelling of 22002121 in words is "twenty-two million, two thousand, one hundred twenty-one".