422725421 has 2 divisors, whose sum is σ = 422725422. Its totient is φ = 422725420.

The previous prime is 422725411. The next prime is 422725447. The reversal of 422725421 is 124527224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278389225 + 144336196 = 16685^2 + 12014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422725421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422725411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211362710 + 211362711.

It is an arithmetic number, because the mean of its divisors is an integer number (211362711).

Almost surely, 2^422725421 is an apocalyptic number.

It is an amenable number.

422725421 is a deficient number, since it is larger than the sum of its proper divisors (1).

422725421 is an equidigital number, since it uses as much as digits as its factorization.

422725421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 29.

The square root of 422725421 is about 20560.2874736712. The cubic root of 422725421 is about 750.5036149388.

The spelling of 422725421 in words is "four hundred twenty-two million, seven hundred twenty-five thousand, four hundred twenty-one".