258026221 has 4 divisors (see below), whose sum is σ = 273204252. Its totient is φ = 242848192.

The previous prime is 258026177. The next prime is 258026231. The reversal of 258026221 is 122620852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 229189321 + 28836900 = 15139^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 258026221 - 2¹⁷ = 257895149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 258026221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258026231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7588990 + ... + 7589023.

It is an arithmetic number, because the mean of its divisors is an integer number (68301063).

Almost surely, 2^258026221 is an apocalyptic number.

It is an amenable number.

258026221 is a deficient number, since it is larger than the sum of its proper divisors (15178031).

258026221 is a wasteful number, since it uses less digits than its factorization.

258026221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15178030.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 258026221 is about 16063.1946075493. The cubic root of 258026221 is about 636.6312419033.

It can be divided in two parts, 25802 and 6221, that added together give a palindrome (32023).

The spelling of 258026221 in words is "two hundred fifty-eight million, twenty-six thousand, two hundred twenty-one".