1211131303123 has 16 divisors (see below), whose sum is σ = 1397887635456. Its totient is φ = 1027813681440.

The previous prime is 1211131303099. The next prime is 1211131303139. The reversal of 1211131303123 is 3213031311121.

It is not a de Polignac number, because 1211131303123 - 2⁵ = 1211131303091 is a prime.

It is a super-2 number, since 2×1211131303123² (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 = 1211131303094 and 1211131303103.

It is not an unprimeable number, because it can be changed into a prime (1211131303423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3235038 + ... + 3589948.

It is an arithmetic number, because the mean of its divisors is an integer number (87367977216).

Almost surely, 2^{1211131303123} is an apocalyptic number.

1211131303123 is a deficient number, since it is larger than the sum of its proper divisors (186756332333).

1211131303123 is a wasteful number, since it uses less digits than its factorization.

1211131303123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359754.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 1211131303123 its reverse (3213031311121), we get a palindrome (4424162614244).

The spelling of 1211131303123 in words is "one trillion, two hundred eleven billion, one hundred thirty-one million, three hundred three thousand, one hundred twenty-three".