255040221 has 8 divisors (see below), whose sum is σ = 340156224. Its totient is φ = 169975520.

The previous prime is 255040217. The next prime is 255040231. The reversal of 255040221 is 122040552.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 255040221 - 2² = 255040217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255040231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865 + ... + 22601.

It is an arithmetic number, because the mean of its divisors is an integer number (42519528).

Almost surely, 2^255040221 is an apocalyptic number.

It is an amenable number.

255040221 is a deficient number, since it is larger than the sum of its proper divisors (85116003).

255040221 is a wasteful number, since it uses less digits than its factorization.

255040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25651.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 255040221 is about 15969.9787413760. The cubic root of 255040221 is about 634.1659092382.

Adding to 255040221 its reverse (122040552), we get a palindrome (377080773).

The spelling of 255040221 in words is "two hundred fifty-five million, forty thousand, two hundred twenty-one".