1213322111 has 4 divisors (see below), whose sum is σ = 1214139552. Its totient is φ = 1212504672.

The previous prime is 1213322101. The next prime is 1213322153. The reversal of 1213322111 is 1112233121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213322111 is a prime.

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 1213322111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213322101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406490 + ... + 409463.

It is an arithmetic number, because the mean of its divisors is an integer number (303534888).

Almost surely, 2^1213322111 is an apocalyptic number.

1213322111 is a deficient number, since it is larger than the sum of its proper divisors (817441).

1213322111 is an equidigital number, since it uses as much as digits as its factorization.

1213322111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817440.

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

The square root of 1213322111 is about 34832.7735186275. The cubic root of 1213322111 is about 1066.5765657076.

Adding to 1213322111 its reverse (1112233121), we get a palindrome (2325555232).

The spelling of 1213322111 in words is "one billion, two hundred thirteen million, three hundred twenty-two thousand, one hundred eleven".