2123251111 has 2 divisors, whose sum is σ = 2123251112. Its totient is φ = 2123251110.

The previous prime is 2123251103. The next prime is 2123251127. The reversal of 2123251111 is 1111523212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2123251111 - 2³ = 2123251103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123251171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061625555 + 1061625556.

It is an arithmetic number, because the mean of its divisors is an integer number (1061625556).

Almost surely, 2^2123251111 is an apocalyptic number.

2123251111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123251111 is an equidigital number, since it uses as much as digits as its factorization.

2123251111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 19.

The square root of 2123251111 is about 46078.7490173073. The cubic root of 2123251111 is about 1285.2880015793.

Adding to 2123251111 its reverse (1111523212), we get a palindrome (3234774323).

The spelling of 2123251111 in words is "two billion, one hundred twenty-three million, two hundred fifty-one thousand, one hundred eleven".