1221002313 has 4 divisors (see below), whose sum is σ = 1628003088. Its totient is φ = 814001540.

The previous prime is 1221002269. The next prime is 1221002327. The reversal of 1221002313 is 3132001221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221002313 - 2¹⁴ = 1220985929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221002292 and 1221002301.

It is not an unprimeable number, because it can be changed into a prime (1221002213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203500383 + ... + 203500388.

It is an arithmetic number, because the mean of its divisors is an integer number (407000772).

Almost surely, 2^1221002313 is an apocalyptic number.

It is an amenable number.

1221002313 is a deficient number, since it is larger than the sum of its proper divisors (407000775).

1221002313 is an equidigital number, since it uses as much as digits as its factorization.

1221002313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407000774.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1221002313 is about 34942.8435162338. The cubic root of 1221002313 is about 1068.8222733382.

Adding to 1221002313 its reverse (3132001221), we get a palindrome (4353003534).

The spelling of 1221002313 in words is "one billion, two hundred twenty-one million, two thousand, three hundred thirteen".