121022112221 has 2 divisors, whose sum is σ = 121022112222. Its totient is φ = 121022112220.

The previous prime is 121022112181. The next prime is 121022112223. The reversal of 121022112221 is 122211220121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65142352900 + 55879759321 = 255230^2 + 236389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121022112221 is a prime.

Together with 121022112223, 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 121022112221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121022112223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60511056110 + 60511056111.

It is an arithmetic number, because the mean of its divisors is an integer number (60511056111).

Almost surely, 2^121022112221 is an apocalyptic number.

It is an amenable number.

121022112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121022112221 is an equidigital number, since it uses as much as digits as its factorization.

121022112221 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 121022112221 its reverse (122211220121), we get a palindrome (243233332342).

The spelling of 121022112221 in words is "one hundred twenty-one billion, twenty-two million, one hundred twelve thousand, two hundred twenty-one".