253340221 has 4 divisors (see below), whose sum is σ = 260187292. Its totient is φ = 246493152.

The previous prime is 253340209. The next prime is 253340233. The reversal of 253340221 is 122043352.

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

It is an interprime number because it is at equal distance from previous prime (253340209) and next prime (253340233).

It can be written as a sum of positive squares in 2 ways, for example, as 238239225 + 15100996 = 15435^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 253340221 - 2⁷ = 253340093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253340192 and 253340201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253340251) 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, 3423480 + ... + 3423553.

It is an arithmetic number, because the mean of its divisors is an integer number (65046823).

Almost surely, 2^253340221 is an apocalyptic number.

It is an amenable number.

253340221 is a deficient number, since it is larger than the sum of its proper divisors (6847071).

253340221 is an equidigital number, since it uses as much as digits as its factorization.

253340221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6847070.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 253340221 is about 15916.6648830715. The cubic root of 253340221 is about 632.7537315675.

Adding to 253340221 its reverse (122043352), we get a palindrome (375383573).

The spelling of 253340221 in words is "two hundred fifty-three million, three hundred forty thousand, two hundred twenty-one".