1221032313 has 20 divisors (see below), whose sum is σ = 1832681488. Its totient is φ = 810152280.

The previous prime is 1221032311. The next prime is 1221032353. The reversal of 1221032313 is 3132301221.

It is not a de Polignac number, because 1221032313 - 2¹ = 1221032311 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221032311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18631 + ... + 52812.

Almost surely, 2^1221032313 is an apocalyptic number.

It is an amenable number.

1221032313 is a deficient number, since it is larger than the sum of its proper divisors (611649175).

1221032313 is an equidigital number, since it uses as much as digits as its factorization.

1221032313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71666 (or 71657 counting only the distinct ones).

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

The square root of 1221032313 is about 34943.2727860457. The cubic root of 1221032313 is about 1068.8310269131.

Adding to 1221032313 its reverse (3132301221), we get a palindrome (4353333534).

The spelling of 1221032313 in words is "one billion, two hundred twenty-one million, thirty-two thousand, three hundred thirteen".