421774321 has 2 divisors, whose sum is σ = 421774322. Its totient is φ = 421774320.

The previous prime is 421774291. The next prime is 421774393. The reversal of 421774321 is 123477124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421070400 + 703921 = 20520^2 + 839^2 .

It is a cyclic number.

It is not a de Polignac number, because 421774321 - 2⁹ = 421773809 is a prime.

It is a super-2 number, since 2×421774321² = 355787155710022082, which contains 22 as substring.

It is a Chen prime.

It is equal to p_22433881 and since 421774321 and 22433881 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (421774121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210887160 + 210887161.

It is an arithmetic number, because the mean of its divisors is an integer number (210887161).

Almost surely, 2^421774321 is an apocalyptic number.

It is an amenable number.

421774321 is a deficient number, since it is larger than the sum of its proper divisors (1).

421774321 is an equidigital number, since it uses as much as digits as its factorization.

421774321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 31.

The square root of 421774321 is about 20537.1449086771. The cubic root of 421774321 is about 749.9403336237.

The spelling of 421774321 in words is "four hundred twenty-one million, seven hundred seventy-four thousand, three hundred twenty-one".