420122221021 has 2 divisors, whose sum is σ = 420122221022. Its totient is φ = 420122221020.

The previous prime is 420122220913. The next prime is 420122221109. The reversal of 420122221021 is 120122221024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313594400025 + 106527820996 = 559995^2 + 326386^2 .

It is a cyclic number.

It is not a de Polignac number, because 420122221021 - 2²⁷ = 419988003293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420122221021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420122221921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210061110510 + 210061110511.

It is an arithmetic number, because the mean of its divisors is an integer number (210061110511).

Almost surely, 2^420122221021 is an apocalyptic number.

It is an amenable number.

420122221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

420122221021 is an equidigital number, since it uses as much as digits as its factorization.

420122221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 420122221021 its reverse (120122221024), we get a palindrome (540244442045).

The spelling of 420122221021 in words is "four hundred twenty billion, one hundred twenty-two million, two hundred twenty-one thousand, twenty-one".