20122122102221 has 2 divisors, whose sum is σ = 20122122102222. Its totient is φ = 20122122102220.

The previous prime is 20122122102191. The next prime is 20122122102289. The reversal of 20122122102221 is 12220122122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14953797276196 + 5168324826025 = 3867014^2 + 2273395^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122122102221 - 2²² = 20122117907917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20122122102193 and 20122122102202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122125102221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061061051110 + 10061061051111.

It is an arithmetic number, because the mean of its divisors is an integer number (10061061051111).

Almost surely, 2^{20122122102221} is an apocalyptic number.

It is an amenable number.

20122122102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122122102221 is an equidigital number, since it uses as much as digits as its factorization.

20122122102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20122122102221 its reverse (12220122122102), we get a palindrome (32342244224323).

The spelling of 20122122102221 in words is "twenty trillion, one hundred twenty-two billion, one hundred twenty-two million, one hundred two thousand, two hundred twenty-one".