258421 has 2 divisors, whose sum is σ = 258422. Its totient is φ = 258420.

The previous prime is 258413. The next prime is 258437. The reversal of 258421 is 124852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171396 + 87025 = 414^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 258421 - 2³ = 258413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 258392 and 258401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129210 + 129211.

It is an arithmetic number, because the mean of its divisors is an integer number (129211).

2²⁵⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

258421 is a deficient number, since it is larger than the sum of its proper divisors (1).

258421 is an equidigital number, since it uses as much as digits as its factorization.

258421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 22.

The square root of 258421 is about 508.3512565146. The cubic root of 258421 is about 63.6955757471.

The spelling of 258421 in words is "two hundred fifty-eight thousand, four hundred twenty-one".