22222121200001 has 2 divisors, whose sum is σ = 22222121200002. Its totient is φ = 22222121200000.

The previous prime is 22222121199989. The next prime is 22222121200009. The reversal of 22222121200001 is 10000212122222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21660423413776 + 561697786225 = 4654076^2 + 749465^2 .

It is a cyclic number.

It is not a de Polignac number, because 22222121200001 - 2⁶ = 22222121199937 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 (22222121200009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11111060600000 + 11111060600001.

It is an arithmetic number, because the mean of its divisors is an integer number (11111060600001).

Almost surely, 2^{22222121200001} is an apocalyptic number.

It is an amenable number.

22222121200001 is a deficient number, since it is larger than the sum of its proper divisors (1).

22222121200001 is an equidigital number, since it uses as much as digits as its factorization.

22222121200001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22222121200001 its reverse (10000212122222), we get a palindrome (32222333322223).

The spelling of 22222121200001 in words is "twenty-two trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred thousand, one".