1253340221 has 16 divisors (see below), whose sum is σ = 1489749888. Its totient is φ = 1032091200.

The previous prime is 1253340203. The next prime is 1253340223. The reversal of 1253340221 is 1220433521.

It is not a de Polignac number, because 1253340221 - 2²² = 1249145917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253340223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15770 + ... + 52491.

It is an arithmetic number, because the mean of its divisors is an integer number (93109368).

Almost surely, 2^1253340221 is an apocalyptic number.

It is an amenable number.

1253340221 is a deficient number, since it is larger than the sum of its proper divisors (236409667).

1253340221 is an equidigital number, since it uses as much as digits as its factorization.

1253340221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68372.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1253340221 is about 35402.5454028379. The cubic root of 1253340221 is about 1078.1759966927.

Adding to 1253340221 its reverse (1220433521), we get a palindrome (2473773742).

The spelling of 1253340221 in words is "one billion, two hundred fifty-three million, three hundred forty thousand, two hundred twenty-one".