422609021 has 2 divisors, whose sum is σ = 422609022. Its totient is φ = 422609020.

The previous prime is 422609009. The next prime is 422609029. The reversal of 422609021 is 120906224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 304886521 + 117722500 = 17461^2 + 10850^2 .

It is a cyclic number.

It is not a de Polignac number, because 422609021 - 2¹⁴ = 422592637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422609029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211304510 + 211304511.

It is an arithmetic number, because the mean of its divisors is an integer number (211304511).

Almost surely, 2^422609021 is an apocalyptic number.

It is an amenable number.

422609021 is a deficient number, since it is larger than the sum of its proper divisors (1).

422609021 is an equidigital number, since it uses as much as digits as its factorization.

422609021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 422609021 is about 20557.4565790615. The cubic root of 422609021 is about 750.4347233795.

The spelling of 422609021 in words is "four hundred twenty-two million, six hundred nine thousand, twenty-one".