420173321 has 2 divisors, whose sum is σ = 420173322. Its totient is φ = 420173320.

The previous prime is 420173317. The next prime is 420173329. The reversal of 420173321 is 123371024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 363321721 + 56851600 = 19061^2 + 7540^2 .

It is a cyclic number.

It is not a de Polignac number, because 420173321 - 2² = 420173317 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420173329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210086660 + 210086661.

It is an arithmetic number, because the mean of its divisors is an integer number (210086661).

Almost surely, 2^420173321 is an apocalyptic number.

It is an amenable number.

420173321 is a deficient number, since it is larger than the sum of its proper divisors (1).

420173321 is an equidigital number, since it uses as much as digits as its factorization.

420173321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 420173321 is about 20498.1296951698. The cubic root of 420173321 is about 748.9902387494.

The spelling of 420173321 in words is "four hundred twenty million, one hundred seventy-three thousand, three hundred twenty-one".