1221313 has 4 divisors (see below), whose sum is σ = 1230768. Its totient is φ = 1211860.

The previous prime is 1221299. The next prime is 1221373. The reversal of 1221313 is 3131221.

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 1221313 - 2⁹ = 1220801 is a prime.

It is a super-3 number, since 3×1221313³ = 5465151358770333891, which contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221293 and 1221302.

It is not an unprimeable number, because it can be changed into a prime (1221373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4531 + ... + 4792.

It is an arithmetic number, because the mean of its divisors is an integer number (307692).

2^1221313 is an apocalyptic number.

It is an amenable number.

1221313 is a deficient number, since it is larger than the sum of its proper divisors (9455).

1221313 is an equidigital number, since it uses as much as digits as its factorization.

1221313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9454.

The product of its digits is 36, while the sum is 13.

The square root of 1221313 is about 1105.1303090586. The cubic root of 1221313 is about 106.8912920457.

Adding to 1221313 its reverse (3131221), we get a palindrome (4352534).

The spelling of 1221313 in words is "one million, two hundred twenty-one thousand, three hundred thirteen".