22002112121221 has 2 divisors, whose sum is σ = 22002112121222. Its totient is φ = 22002112121220.

The previous prime is 22002112121219. The next prime is 22002112121237. The reversal of 22002112121221 is 12212121120022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22002094228321 + 17892900 = 4690639^2 + 4230^2 .

It is a cyclic number.

It is not a de Polignac number, because 22002112121221 - 2¹ = 22002112121219 is a prime.

Together with 22002112121219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22002112131221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11001056060610 + 11001056060611.

It is an arithmetic number, because the mean of its divisors is an integer number (11001056060611).

Almost surely, 2^{22002112121221} is an apocalyptic number.

It is an amenable number.

22002112121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22002112121221 is an equidigital number, since it uses as much as digits as its factorization.

22002112121221 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 19.

Adding to 22002112121221 its reverse (12212121120022), we get a palindrome (34214233241243).

The spelling of 22002112121221 in words is "twenty-two trillion, two billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".