421040381 has 2 divisors, whose sum is σ = 421040382. Its totient is φ = 421040380.

The previous prime is 421040339. The next prime is 421040393. The reversal of 421040381 is 183040124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412455481 + 8584900 = 20309^2 + 2930^2 .

It is a cyclic number.

It is not a de Polignac number, because 421040381 - 2⁶ = 421040317 is a prime.

It is a super-2 number, since 2×421040381² = 354550004865250322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421040311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210520190 + 210520191.

It is an arithmetic number, because the mean of its divisors is an integer number (210520191).

Almost surely, 2^421040381 is an apocalyptic number.

It is an amenable number.

421040381 is a deficient number, since it is larger than the sum of its proper divisors (1).

421040381 is an equidigital number, since it uses as much as digits as its factorization.

421040381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 421040381 is about 20519.2685298477. The cubic root of 421040381 is about 749.5050844463.

The spelling of 421040381 in words is "four hundred twenty-one million, forty thousand, three hundred eighty-one".