253155221 has 24 divisors (see below), whose sum is σ = 299520864. Its totient is φ = 212012640.

The previous prime is 253155193. The next prime is 253155251. The reversal of 253155221 is 122551352.

It is not a de Polignac number, because 253155221 - 2⁶ = 253155157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253155251) 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 in 23 ways as a sum of consecutive naturals, for example, 146066 + ... + 147788.

It is an arithmetic number, because the mean of its divisors is an integer number (12480036).

Almost surely, 2^253155221 is an apocalyptic number.

It is an amenable number.

253155221 is a deficient number, since it is larger than the sum of its proper divisors (46365643).

253155221 is a wasteful number, since it uses less digits than its factorization.

253155221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809 (or 1790 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 253155221 is about 15910.8523027524. The cubic root of 253155221 is about 632.5996726694.

The spelling of 253155221 in words is "two hundred fifty-three million, one hundred fifty-five thousand, two hundred twenty-one".