1211231223 has 12 divisors (see below), whose sum is σ = 1796842008. Its totient is φ = 785663280.

The previous prime is 1211231213. The next prime is 1211231233. The reversal of 1211231223 is 3221321121.

1211231223 is a `hidden beast` number, since 1 + 211 + 231 + 223 = 666.

It is an interprime number because it is at equal distance from previous prime (1211231213) and next prime (1211231233).

It is not a de Polignac number, because 1211231223 - 2⁹ = 1211230711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211231196 and 1211231205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211231213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1818333 + ... + 1818998.

It is an arithmetic number, because the mean of its divisors is an integer number (149736834).

Almost surely, 2^1211231223 is an apocalyptic number.

1211231223 is a deficient number, since it is larger than the sum of its proper divisors (585610785).

1211231223 is a wasteful number, since it uses less digits than its factorization.

1211231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3637374 (or 3637371 counting only the distinct ones).

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

The square root of 1211231223 is about 34802.7473484494. The cubic root of 1211231223 is about 1065.9635450950.

Adding to 1211231223 its reverse (3221321121), we get a palindrome (4432552344).

The spelling of 1211231223 in words is "one billion, two hundred eleven million, two hundred thirty-one thousand, two hundred twenty-three".