421255231 has 2 divisors, whose sum is σ = 421255232. Its totient is φ = 421255230.

The previous prime is 421255217. The next prime is 421255273. The reversal of 421255231 is 132552124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421255231 is a prime.

It is a super-2 number, since 2×421255231² = 354911939289726722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421255196 and 421255205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421255531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210627615 + 210627616.

It is an arithmetic number, because the mean of its divisors is an integer number (210627616).

Almost surely, 2^421255231 is an apocalyptic number.

421255231 is a deficient number, since it is larger than the sum of its proper divisors (1).

421255231 is an equidigital number, since it uses as much as digits as its factorization.

421255231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 421255231 is about 20524.5031852174. The cubic root of 421255231 is about 749.6325494844.

The spelling of 421255231 in words is "four hundred twenty-one million, two hundred fifty-five thousand, two hundred thirty-one".