2123123311 has 2 divisors, whose sum is σ = 2123123312. Its totient is φ = 2123123310.

The previous prime is 2123123291. The next prime is 2123123329. The reversal of 2123123311 is 1133213212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2123123311 - 2¹¹ = 2123121263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123123371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061561655 + 1061561656.

It is an arithmetic number, because the mean of its divisors is an integer number (1061561656).

Almost surely, 2^2123123311 is an apocalyptic number.

2123123311 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123123311 is an equidigital number, since it uses as much as digits as its factorization.

2123123311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 2123123311 is about 46077.3622400415. The cubic root of 2123123311 is about 1285.2622135945.

Adding to 2123123311 its reverse (1133213212), we get a palindrome (3256336523).

The spelling of 2123123311 in words is "two billion, one hundred twenty-three million, one hundred twenty-three thousand, three hundred eleven".