1211311331223 has 32 divisors (see below), whose sum is σ = 1955885331456. Its totient is φ = 650961335808.

The previous prime is 1211311331177. The next prime is 1211311331231. The reversal of 1211311331223 is 3221331131121.

It is not a de Polignac number, because 1211311331223 - 2¹⁰ = 1211311330199 is a prime.

It is a super-2 number, since 2×1211311331223² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211311331193 and 1211311331202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211311331273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 836836 + ... + 1767177.

It is an arithmetic number, because the mean of its divisors is an integer number (61121416608).

Almost surely, 2^{1211311331223} is an apocalyptic number.

1211311331223 is a deficient number, since it is larger than the sum of its proper divisors (744574000233).

1211311331223 is a wasteful number, since it uses less digits than its factorization.

1211311331223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605343.

The product of its digits is 648, while the sum is 24.

Adding to 1211311331223 its reverse (3221331131121), we get a palindrome (4432642462344).

The spelling of 1211311331223 in words is "one trillion, two hundred eleven billion, three hundred eleven million, three hundred thirty-one thousand, two hundred twenty-three".