422620421 has 2 divisors, whose sum is σ = 422620422. Its totient is φ = 422620420.

The previous prime is 422620411. The next prime is 422620447. The reversal of 422620421 is 124026224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 356832100 + 65788321 = 18890^2 + 8111^2 .

It is a cyclic number.

It is not a de Polignac number, because 422620421 - 2²⁶ = 355511557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422620411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211310210 + 211310211.

It is an arithmetic number, because the mean of its divisors is an integer number (211310211).

Almost surely, 2^422620421 is an apocalyptic number.

It is an amenable number.

422620421 is a deficient number, since it is larger than the sum of its proper divisors (1).

422620421 is an equidigital number, since it uses as much as digits as its factorization.

422620421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 422620421 is about 20557.7338488463. The cubic root of 422620421 is about 750.4414710497.

Adding to 422620421 its reverse (124026224), we get a palindrome (546646645).

The spelling of 422620421 in words is "four hundred twenty-two million, six hundred twenty thousand, four hundred twenty-one".