2222122100921 has 2 divisors, whose sum is σ = 2222122100922. Its totient is φ = 2222122100920.

The previous prime is 2222122100917. The next prime is 2222122100941. The reversal of 2222122100921 is 1290012212222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2196309180025 + 25812920896 = 1481995^2 + 160664^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222122100921 - 2² = 2222122100917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2222122100941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111061050460 + 1111061050461.

It is an arithmetic number, because the mean of its divisors is an integer number (1111061050461).

Almost surely, 2^{2222122100921} is an apocalyptic number.

It is an amenable number.

2222122100921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222122100921 is an equidigital number, since it uses as much as digits as its factorization.

2222122100921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 2222122100921 in words is "two trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred thousand, nine hundred twenty-one".