1213111322 has 4 divisors (see below), whose sum is σ = 1819666986. Its totient is φ = 606555660.

The previous prime is 1213111307. The next prime is 1213111327. The reversal of 1213111322 is 2231113121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2231113121 = 31 ⋅71971391.

It can be written as a sum of positive squares in only one way, i.e., 829382401 + 383728921 = 28799^2 + 19589^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1213111322.

It is not an unprimeable number, because it can be changed into a prime (1213111327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303277829 + ... + 303277832.

Almost surely, 2^1213111322 is an apocalyptic number.

1213111322 is a deficient number, since it is larger than the sum of its proper divisors (606555664).

1213111322 is an equidigital number, since it uses as much as digits as its factorization.

1213111322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606555663.

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

The square root of 1213111322 is about 34829.7476591491. The cubic root of 1213111322 is about 1066.5147971065.

Adding to 1213111322 its reverse (2231113121), we get a palindrome (3444224443).

The spelling of 1213111322 in words is "one billion, two hundred thirteen million, one hundred eleven thousand, three hundred twenty-two".