1221324313 has 16 divisors (see below), whose sum is σ = 1435104000. Its totient is φ = 1027388880.

The previous prime is 1221324289. The next prime is 1221324331. The reversal of 1221324313 is 3134231221.

It is a cyclic number.

It is not a de Polignac number, because 1221324313 - 2⁹ = 1221323801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221324373) 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, 58963 + ... + 76936.

It is an arithmetic number, because the mean of its divisors is an integer number (89694000).

Almost surely, 2^1221324313 is an apocalyptic number.

It is an amenable number.

1221324313 is a deficient number, since it is larger than the sum of its proper divisors (213779687).

1221324313 is a wasteful number, since it uses less digits than its factorization.

1221324313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135972.

The product of its digits is 864, while the sum is 22.

The square root of 1221324313 is about 34947.4507367848. The cubic root of 1221324313 is about 1068.9162208869.

Adding to 1221324313 its reverse (3134231221), we get a palindrome (4355555534).

The spelling of 1221324313 in words is "one billion, two hundred twenty-one million, three hundred twenty-four thousand, three hundred thirteen".