1223213231 has 4 divisors (see below), whose sum is σ = 1223283264. Its totient is φ = 1223143200.

The previous prime is 1223213227. The next prime is 1223213237. The reversal of 1223213231 is 1323123221.

It is a semiprime because it is the product of two primes, 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 1223213231 - 2² = 1223213227 is a prime.

It is a super-2 number, since 2×1223213231² = 2992501216986918722, 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 (1223213237) 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, 14951 + ... + 51671.

It is an arithmetic number, because the mean of its divisors is an integer number (305820816).

Almost surely, 2^1223213231 is an apocalyptic number.

1223213231 is a deficient number, since it is larger than the sum of its proper divisors (70033).

1223213231 is an equidigital number, since it uses as much as digits as its factorization.

1223213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70032.

The product of its digits is 432, while the sum is 20.

The square root of 1223213231 is about 34974.4654140703. The cubic root of 1223213231 is about 1069.4670041750.

Adding to 1223213231 its reverse (1323123221), we get a palindrome (2546336452).

The spelling of 1223213231 in words is "one billion, two hundred twenty-three million, two hundred thirteen thousand, two hundred thirty-one".