421204181 has 2 divisors, whose sum is σ = 421204182. Its totient is φ = 421204180.

The previous prime is 421204097. The next prime is 421204219. The reversal of 421204181 is 181402124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381577156 + 39627025 = 19534^2 + 6295^2 .

It is a cyclic number.

It is not a de Polignac number, because 421204181 - 2¹⁴ = 421187797 is a prime.

It is a super-2 number, since 2×421204181² = 354825924183761522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421204981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210602090 + 210602091.

It is an arithmetic number, because the mean of its divisors is an integer number (210602091).

Almost surely, 2^421204181 is an apocalyptic number.

It is an amenable number.

421204181 is a deficient number, since it is larger than the sum of its proper divisors (1).

421204181 is an equidigital number, since it uses as much as digits as its factorization.

421204181 is an odious number, because the sum of its binary digits is odd.

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

The square root of 421204181 is about 20523.2595120756. The cubic root of 421204181 is about 749.6022667446.

The spelling of 421204181 in words is "four hundred twenty-one million, two hundred four thousand, one hundred eighty-one".