1323220111 has 4 divisors (see below), whose sum is σ = 1326767992. Its totient is φ = 1319672232.

The previous prime is 1323220099. The next prime is 1323220121. The reversal of 1323220111 is 1110223231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1323220111 - 2⁵ = 1323220079 is a prime.

It is a super-2 number, since 2×1323220111² = 3501822924309704642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323220121) 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, 1773381 + ... + 1774126.

It is an arithmetic number, because the mean of its divisors is an integer number (331691998).

Almost surely, 2^1323220111 is an apocalyptic number.

1323220111 is a deficient number, since it is larger than the sum of its proper divisors (3547881).

1323220111 is an equidigital number, since it uses as much as digits as its factorization.

1323220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547880.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1323220111 is about 36376.0925746568. The cubic root of 1323220111 is about 1097.8525904653.

Adding to 1323220111 its reverse (1110223231), we get a palindrome (2433443342).

The spelling of 1323220111 in words is "one billion, three hundred twenty-three million, two hundred twenty thousand, one hundred eleven".