253238221 has 4 divisors (see below), whose sum is σ = 254289244. Its totient is φ = 252187200.

The previous prime is 253238203. The next prime is 253238231. The reversal of 253238221 is 122832352.

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 120758121 + 132480100 = 10989^2 + 11510^2 .

It is a cyclic number.

It is not a de Polignac number, because 253238221 - 2⁷ = 253238093 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 253238221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253238201) 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, 525150 + ... + 525631.

It is an arithmetic number, because the mean of its divisors is an integer number (63572311).

Almost surely, 2^253238221 is an apocalyptic number.

It is an amenable number.

253238221 is a deficient number, since it is larger than the sum of its proper divisors (1051023).

253238221 is a wasteful number, since it uses less digits than its factorization.

253238221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051022.

The product of its digits is 5760, while the sum is 28.

The square root of 253238221 is about 15913.4603716476. The cubic root of 253238221 is about 632.6688002656.

The spelling of 253238221 in words is "two hundred fifty-three million, two hundred thirty-eight thousand, two hundred twenty-one".