1211312223 has 24 divisors (see below), whose sum is σ = 1974557520. Its totient is φ = 708812160.

The previous prime is 1211312213. The next prime is 1211312231. The reversal of 1211312223 is 3222131121.

It is not a de Polignac number, because 1211312223 - 2⁸ = 1211311967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211312196 and 1211312205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211312213) 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, 208086 + ... + 213827.

It is an arithmetic number, because the mean of its divisors is an integer number (82273230).

Almost surely, 2^1211312223 is an apocalyptic number.

1211312223 is a deficient number, since it is larger than the sum of its proper divisors (763245297).

1211312223 is a wasteful number, since it uses less digits than its factorization.

1211312223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421959 (or 421956 counting only the distinct ones).

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

The square root of 1211312223 is about 34803.9110302276. The cubic root of 1211312223 is about 1065.9873063502.

Adding to 1211312223 its reverse (3222131121), we get a palindrome (4433443344).

It can be divided in two parts, 12113 and 12223, that added together give a square (24336 = 156²).

The spelling of 1211312223 in words is "one billion, two hundred eleven million, three hundred twelve thousand, two hundred twenty-three".