1223121112311 has 16 divisors (see below), whose sum is σ = 1866757349888. Its totient is φ = 697818693600.

The previous prime is 1223121112273. The next prime is 1223121112319. The reversal of 1223121112311 is 1132111213221.

It is not a de Polignac number, because 1223121112311 - 2²⁷ = 1222986894583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223121112319) 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, 46138780 + ... + 46165281.

It is an arithmetic number, because the mean of its divisors is an integer number (116672334368).

Almost surely, 2^{1223121112311} is an apocalyptic number.

1223121112311 is a deficient number, since it is larger than the sum of its proper divisors (643636237577).

1223121112311 is an equidigital number, since it uses as much as digits as its factorization.

1223121112311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92304702.

The product of its digits is 144, while the sum is 21.

Adding to 1223121112311 its reverse (1132111213221), we get a palindrome (2355232325532).

The spelling of 1223121112311 in words is "one trillion, two hundred twenty-three billion, one hundred twenty-one million, one hundred twelve thousand, three hundred eleven".