1223212311 has 24 divisors (see below), whose sum is σ = 1789132800. Its totient is φ = 805257936.

The previous prime is 1223212303. The next prime is 1223212363. The reversal of 1223212311 is 1132123221.

1223212311 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1223212311 - 2³ = 1223212303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223212391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 252490 + ... + 257288.

It is an arithmetic number, because the mean of its divisors is an integer number (74547200).

Almost surely, 2^1223212311 is an apocalyptic number.

1223212311 is a deficient number, since it is larger than the sum of its proper divisors (565920489).

1223212311 is a wasteful number, since it uses less digits than its factorization.

1223212311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155 (or 5152 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1223212311 is about 34974.4522616152. The cubic root of 1223212311 is about 1069.4667360534.

Adding to 1223212311 its reverse (1132123221), we get a palindrome (2355335532).

The spelling of 1223212311 in words is "one billion, two hundred twenty-three million, two hundred twelve thousand, three hundred eleven".