1221302313 has 48 divisors (see below), whose sum is σ = 2296105920. Its totient is φ = 634435200.

The previous prime is 1221302281. The next prime is 1221302333. The reversal of 1221302313 is 3132031221.

It is not a de Polignac number, because 1221302313 - 2⁵ = 1221302281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221302333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27408 + ... + 56513.

It is an arithmetic number, because the mean of its divisors is an integer number (47835540).

Almost surely, 2^1221302313 is an apocalyptic number.

It is an amenable number.

1221302313 is a deficient number, since it is larger than the sum of its proper divisors (1074803607).

1221302313 is a wasteful number, since it uses less digits than its factorization.

1221302313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83955 (or 83942 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1221302313 is about 34947.1359770726. The cubic root of 1221302313 is about 1068.9098026359.

Adding to 1221302313 its reverse (3132031221), we get a palindrome (4353333534).

The spelling of 1221302313 in words is "one billion, two hundred twenty-one million, three hundred two thousand, three hundred thirteen".