421045381 has 2 divisors, whose sum is σ = 421045382. Its totient is φ = 421045380.

The previous prime is 421045367. The next prime is 421045421. The reversal of 421045381 is 183540124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362293156 + 58752225 = 19034^2 + 7665^2 .

It is a cyclic number.

It is not a de Polignac number, because 421045381 - 2⁷ = 421045253 is a prime.

It is a super-2 number, since 2×421045381² = 354558425722870322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421040381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210522690 + 210522691.

It is an arithmetic number, because the mean of its divisors is an integer number (210522691).

Almost surely, 2^421045381 is an apocalyptic number.

It is an amenable number.

421045381 is a deficient number, since it is larger than the sum of its proper divisors (1).

421045381 is an equidigital number, since it uses as much as digits as its factorization.

421045381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 421045381 is about 20519.3903661878. The cubic root of 421045381 is about 749.5080513118.

The spelling of 421045381 in words is "four hundred twenty-one million, forty-five thousand, three hundred eighty-one".