421094783581 has 2 divisors, whose sum is σ = 421094783582. Its totient is φ = 421094783580.

The previous prime is 421094783561. The next prime is 421094783587. The reversal of 421094783581 is 185387490124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401374198681 + 19720584900 = 633541^2 + 140430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421094783581 is a prime.

It is a super-2 number, since 2×421094783581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421094783587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210547391790 + 210547391791.

It is an arithmetic number, because the mean of its divisors is an integer number (210547391791).

Almost surely, 2^421094783581 is an apocalyptic number.

It is an amenable number.

421094783581 is a deficient number, since it is larger than the sum of its proper divisors (1).

421094783581 is an equidigital number, since it uses as much as digits as its factorization.

421094783581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 421094783581 in words is "four hundred twenty-one billion, ninety-four million, seven hundred eighty-three thousand, five hundred eighty-one".