1213321111123 has 16 divisors (see below), whose sum is σ = 1333464814080. Its totient is φ = 1094821509600.

The previous prime is 1213321111117. The next prime is 1213321111127. The reversal of 1213321111123 is 3211111233121.

It is a cyclic number.

It is not a de Polignac number, because 1213321111123 - 2⁵ = 1213321111091 is a prime.

It is a super-2 number, since 2×1213321111123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213321111094 and 1213321111103.

It is not an unprimeable number, because it can be changed into a prime (1213321111127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6437461 + ... + 6623257.

It is an arithmetic number, because the mean of its divisors is an integer number (83341550880).

Almost surely, 2^{1213321111123} is an apocalyptic number.

1213321111123 is a deficient number, since it is larger than the sum of its proper divisors (120143702957).

1213321111123 is a wasteful number, since it uses less digits than its factorization.

1213321111123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190218.

The product of its digits is 216, while the sum is 22.

Adding to 1213321111123 its reverse (3211111233121), we get a palindrome (4424432344244).

The spelling of 1213321111123 in words is "one trillion, two hundred thirteen billion, three hundred twenty-one million, one hundred eleven thousand, one hundred twenty-three".