1321253345 has 32 divisors (see below), whose sum is σ = 1712648448. Its totient is φ = 974952448.

The previous prime is 1321253341. The next prime is 1321253347. The reversal of 1321253345 is 5433521231.

It is a happy number.

It is not a de Polignac number, because 1321253345 - 2² = 1321253341 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321253341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 965852 + ... + 967218.

It is an arithmetic number, because the mean of its divisors is an integer number (53520264).

Almost surely, 2^1321253345 is an apocalyptic number.

It is an amenable number.

1321253345 is a deficient number, since it is larger than the sum of its proper divisors (391395103).

1321253345 is a wasteful number, since it uses less digits than its factorization.

1321253345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609.

The product of its digits is 10800, while the sum is 29.

The square root of 1321253345 is about 36349.0487495890. The cubic root of 1321253345 is about 1097.3083902983.

Adding to 1321253345 its reverse (5433521231), we get a palindrome (6754774576).

The spelling of 1321253345 in words is "one billion, three hundred twenty-one million, two hundred fifty-three thousand, three hundred forty-five".