1253221345 has 16 divisors (see below), whose sum is σ = 1554094080. Its totient is φ = 969163200.

The previous prime is 1253221331. The next prime is 1253221357. The reversal of 1253221345 is 5431223521.

It is not a de Polignac number, because 1253221345 - 2²⁵ = 1219666913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154296 + ... + 162214.

It is an arithmetic number, because the mean of its divisors is an integer number (97130880).

Almost surely, 2^1253221345 is an apocalyptic number.

It is an amenable number.

1253221345 is a deficient number, since it is larger than the sum of its proper divisors (300872735).

1253221345 is a wasteful number, since it uses less digits than its factorization.

1253221345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8976.

The product of its digits is 7200, while the sum is 28.

The square root of 1253221345 is about 35400.8664441988. The cubic root of 1253221345 is about 1078.1419082358.

Adding to 1253221345 its reverse (5431223521), we get a palindrome (6684444866).

The spelling of 1253221345 in words is "one billion, two hundred fifty-three million, two hundred twenty-one thousand, three hundred forty-five".