1322111221 has 4 divisors (see below), whose sum is σ = 1322193600. Its totient is φ = 1322028844.

The previous prime is 1322111213. The next prime is 1322111227. The reversal of 1322111221 is 1221112231.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1322111221 - 2³ = 1322111213 is a prime.

It is a super-2 number, since 2×1322111221² = 3495956161388221682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1322111195 and 1322111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1322111227) 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, 8431 + ... + 52108.

It is an arithmetic number, because the mean of its divisors is an integer number (330548400).

Almost surely, 2^1322111221 is an apocalyptic number.

It is an amenable number.

1322111221 is a deficient number, since it is larger than the sum of its proper divisors (82379).

1322111221 is an equidigital number, since it uses as much as digits as its factorization.

1322111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82378.

The product of its digits is 48, while the sum is 16.

The square root of 1322111221 is about 36360.8473636135. The cubic root of 1322111221 is about 1097.5458292100.

Adding to 1322111221 its reverse (1221112231), we get a palindrome (2543223452).

It can be divided in two parts, 13221 and 11221, that added together give a palindrome (24442).

The spelling of 1322111221 in words is "one billion, three hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".