1211111311123 has 8 divisors (see below), whose sum is σ = 1384165352960. Its totient is φ = 1038066804360.

The previous prime is 1211111311103. The next prime is 1211111311133. The reversal of 1211111311123 is 3211131111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211111311123 - 2¹³ = 1211111302931 is a prime.

It is a super-2 number, since 2×1211111311123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211111311123.

It is not an unprimeable number, because it can be changed into a prime (1211111311103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2109483 + ... + 2621476.

It is an arithmetic number, because the mean of its divisors is an integer number (173020669120).

Almost surely, 2^{1211111311123} is an apocalyptic number.

1211111311123 is a deficient number, since it is larger than the sum of its proper divisors (173054041837).

1211111311123 is an equidigital number, since it uses as much as digits as its factorization.

1211111311123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4767537.

The product of its digits is 36, while the sum is 19.

Adding to 1211111311123 its reverse (3211131111121), we get a palindrome (4422242422244).

The spelling of 1211111311123 in words is "one trillion, two hundred eleven billion, one hundred eleven million, three hundred eleven thousand, one hundred twenty-three".