1213311123 has 32 divisors (see below), whose sum is σ = 1823270400. Its totient is φ = 797364000.

The previous prime is 1213311103. The next prime is 1213311149. The reversal of 1213311123 is 3211133121.

It is not a de Polignac number, because 1213311123 - 2⁶ = 1213311059 is a prime.

It is a super-2 number, since 2×1213311123² = 2944247762391042258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1213311096 and 1213311105.

It is not an unprimeable number, because it can be changed into a prime (1213311103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 565633 + ... + 567773.

It is an arithmetic number, because the mean of its divisors is an integer number (56977200).

Almost surely, 2^1213311123 is an apocalyptic number.

1213311123 is a deficient number, since it is larger than the sum of its proper divisors (609959277).

1213311123 is a wasteful number, since it uses less digits than its factorization.

1213311123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440 (or 2434 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1213311123 is about 34832.6157932476. The cubic root of 1213311123 is about 1066.5733460133.

Adding to 1213311123 its reverse (3211133121), we get a palindrome (4424444244).

The spelling of 1213311123 in words is "one billion, two hundred thirteen million, three hundred eleven thousand, one hundred twenty-three".