1211123101123 has 16 divisors (see below), whose sum is σ = 1346427077632. Its totient is φ = 1081842804000.

The previous prime is 1211123101121. The next prime is 1211123101157. The reversal of 1211123101123 is 3211013211121.

It is a cyclic number.

It is not a de Polignac number, because 1211123101123 - 2¹ = 1211123101121 is a prime.

It is a super-2 number, since 2×1211123101123² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211123101123.

It is not an unprimeable number, because it can be changed into a prime (1211123101121) 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, 9597628 + ... + 9722998.

It is an arithmetic number, because the mean of its divisors is an integer number (84151692352).

Almost surely, 2^{1211123101123} is an apocalyptic number.

1211123101123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1211123101123 is a deficient number, since it is larger than the sum of its proper divisors (135303976509).

1211123101123 is a wasteful number, since it uses less digits than its factorization.

1211123101123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149386.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1211123101123 its reverse (3211013211121), we get a palindrome (4422136312244).

The spelling of 1211123101123 in words is "one trillion, two hundred eleven billion, one hundred twenty-three million, one hundred one thousand, one hundred twenty-three".