421421081 has 2 divisors, whose sum is σ = 421421082. Its totient is φ = 421421080.

The previous prime is 421421053. The next prime is 421421093. The reversal of 421421081 is 180124124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400800400 + 20620681 = 20020^2 + 4541^2 .

It is a cyclic number.

It is not a de Polignac number, because 421421081 - 2⁶ = 421421017 is a prime.

It is a super-2 number, since 2×421421081² = 355191455022417122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421421681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210710540 + 210710541.

It is an arithmetic number, because the mean of its divisors is an integer number (210710541).

Almost surely, 2^421421081 is an apocalyptic number.

It is an amenable number.

421421081 is a deficient number, since it is larger than the sum of its proper divisors (1).

421421081 is an equidigital number, since it uses as much as digits as its factorization.

421421081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 421421081 is about 20528.5430803065. The cubic root of 421421081 is about 749.7309144318.

The spelling of 421421081 in words is "four hundred twenty-one million, four hundred twenty-one thousand, eighty-one".