421907257 has 2 divisors, whose sum is σ = 421907258. Its totient is φ = 421907256.

The previous prime is 421907249. The next prime is 421907273. The reversal of 421907257 is 752709124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395651881 + 26255376 = 19891^2 + 5124^2 .

It is a cyclic number.

It is not a de Polignac number, because 421907257 - 2³ = 421907249 is a prime.

It is not a weakly prime, because it can be changed into another prime (421904257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210953628 + 210953629.

It is an arithmetic number, because the mean of its divisors is an integer number (210953629).

Almost surely, 2^421907257 is an apocalyptic number.

It is an amenable number.

421907257 is a deficient number, since it is larger than the sum of its proper divisors (1).

421907257 is an equidigital number, since it uses as much as digits as its factorization.

421907257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 421907257 is about 20540.3811308359. The cubic root of 421907257 is about 750.0191147721.

The spelling of 421907257 in words is "four hundred twenty-one million, nine hundred seven thousand, two hundred fifty-seven".