211121311123 has 2 divisors, whose sum is σ = 211121311124. Its totient is φ = 211121311122.

The previous prime is 211121311091. The next prime is 211121311129. The reversal of 211121311123 is 321113121112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211121311123 - 2⁵ = 211121311091 is a prime.

It is a super-2 number, since 2×211121311123² (a number of 23 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 211121311123.

It is not a weakly prime, because it can be changed into another prime (211121311129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560655561 + 105560655562.

It is an arithmetic number, because the mean of its divisors is an integer number (105560655562).

Almost surely, 2^211121311123 is an apocalyptic number.

211121311123 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121311123 is an equidigital number, since it uses as much as digits as its factorization.

211121311123 is an odious number, because the sum of its binary digits is odd.

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

Adding to 211121311123 its reverse (321113121112), we get a palindrome (532234432235).

The spelling of 211121311123 in words is "two hundred eleven billion, one hundred twenty-one million, three hundred eleven thousand, one hundred twenty-three".