1221113321 has 4 divisors (see below), whose sum is σ = 1222569600. Its totient is φ = 1219657044.

The previous prime is 1221113317. The next prime is 1221113323. The reversal of 1221113321 is 1233111221.

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 1221113321 - 2² = 1221113317 is a prime.

It is a super-2 number, since 2×1221113321² = 2982235485447298082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221113321.

It is not an unprimeable number, because it can be changed into a prime (1221113323) 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, 726881 + ... + 728558.

It is an arithmetic number, because the mean of its divisors is an integer number (305642400).

Almost surely, 2^1221113321 is an apocalyptic number.

It is an amenable number.

1221113321 is a deficient number, since it is larger than the sum of its proper divisors (1456279).

1221113321 is an equidigital number, since it uses as much as digits as its factorization.

1221113321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456278.

The product of its digits is 72, while the sum is 17.

The square root of 1221113321 is about 34944.4319026651. The cubic root of 1221113321 is about 1068.8546631834.

Adding to 1221113321 its reverse (1233111221), we get a palindrome (2454224542).

The spelling of 1221113321 in words is "one billion, two hundred twenty-one million, one hundred thirteen thousand, three hundred twenty-one".