22102100121221 has 2 divisors, whose sum is σ = 22102100121222. Its totient is φ = 22102100121220.

The previous prime is 22102100121209. The next prime is 22102100121223. The reversal of 22102100121221 is 12212100120122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22010829064900 + 91271056321 = 4691570^2 + 302111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22102100121221 is a prime.

Together with 22102100121223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22102100121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22102100121223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11051050060610 + 11051050060611.

It is an arithmetic number, because the mean of its divisors is an integer number (11051050060611).

Almost surely, 2^{22102100121221} is an apocalyptic number.

It is an amenable number.

22102100121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22102100121221 is an equidigital number, since it uses as much as digits as its factorization.

22102100121221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22102100121221 its reverse (12212100120122), we get a palindrome (34314200241343).

The spelling of 22102100121221 in words is "twenty-two trillion, one hundred two billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".