253221723 has 6 divisors (see below), whose sum is σ = 365764724. Its totient is φ = 168814476.

The previous prime is 253221719. The next prime is 253221751. The reversal of 253221723 is 327122352.

It is a happy number.

It is not a de Polignac number, because 253221723 - 2² = 253221719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253221763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14067865 + ... + 14067882.

Almost surely, 2^253221723 is an apocalyptic number.

253221723 is a deficient number, since it is larger than the sum of its proper divisors (112543001).

253221723 is a wasteful number, since it uses less digits than its factorization.

253221723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28135753 (or 28135750 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 253221723 is about 15912.9419970036. The cubic root of 253221723 is about 632.6550609012.

The spelling of 253221723 in words is "two hundred fifty-three million, two hundred twenty-one thousand, seven hundred twenty-three".