2204122220021 has 2 divisors, whose sum is σ = 2204122220022. Its totient is φ = 2204122220020.

The previous prime is 2204122219993. The next prime is 2204122220023. The reversal of 2204122220021 is 1200222214022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2097790140625 + 106332079396 = 1448375^2 + 326086^2 .

It is a cyclic number.

It is not a de Polignac number, because 2204122220021 - 2²⁶ = 2204055111157 is a prime.

Together with 2204122220023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2204122219975 and 2204122220002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2204122220023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102061110010 + 1102061110011.

It is an arithmetic number, because the mean of its divisors is an integer number (1102061110011).

Almost surely, 2^{2204122220021} is an apocalyptic number.

It is an amenable number.

2204122220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2204122220021 is an equidigital number, since it uses as much as digits as its factorization.

2204122220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 2204122220021 its reverse (1200222214022), we get a palindrome (3404344434043).

The spelling of 2204122220021 in words is "two trillion, two hundred four billion, one hundred twenty-two million, two hundred twenty thousand, twenty-one".