258321221 has 2 divisors, whose sum is σ = 258321222. Its totient is φ = 258321220.

The previous prime is 258321179. The next prime is 258321223. The reversal of 258321221 is 122123852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160528900 + 97792321 = 12670^2 + 9889^2 .

It is a cyclic number.

It is not a de Polignac number, because 258321221 - 2⁶ = 258321157 is a prime.

It is a Sophie Germain prime.

Together with 258321223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258321223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129160610 + 129160611.

It is an arithmetic number, because the mean of its divisors is an integer number (129160611).

Almost surely, 2^258321221 is an apocalyptic number.

It is an amenable number.

258321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

258321221 is an equidigital number, since it uses as much as digits as its factorization.

258321221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 26.

The square root of 258321221 is about 16072.3744667675. The cubic root of 258321221 is about 636.8737685328.

The spelling of 258321221 in words is "two hundred fifty-eight million, three hundred twenty-one thousand, two hundred twenty-one".