22102021121221 has 2 divisors, whose sum is σ = 22102021121222. Its totient is φ = 22102021121220.

The previous prime is 22102021121197. The next prime is 22102021121231. The reversal of 22102021121221 is 12212112020122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18809447564196 + 3292573557025 = 4336986^2 + 1814545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22102021121221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22102021121231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11051010560610 + 11051010560611.

It is an arithmetic number, because the mean of its divisors is an integer number (11051010560611).

Almost surely, 2^{22102021121221} is an apocalyptic number.

It is an amenable number.

22102021121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22102021121221 is an equidigital number, since it uses as much as digits as its factorization.

22102021121221 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 22102021121221 its reverse (12212112020122), we get a palindrome (34314133141343).

The spelling of 22102021121221 in words is "twenty-two trillion, one hundred two billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".