2112123757 has 2 divisors, whose sum is σ = 2112123758. Its totient is φ = 2112123756.

The previous prime is 2112123731. The next prime is 2112123773. The reversal of 2112123757 is 7573212112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1674937476 + 437186281 = 40926^2 + 20909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2112123757 is a prime.

It is a super-2 number, since 2×2112123757² = 8922133529767590098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112123257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056061878 + 1056061879.

It is an arithmetic number, because the mean of its divisors is an integer number (1056061879).

Almost surely, 2^2112123757 is an apocalyptic number.

It is an amenable number.

2112123757 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112123757 is an equidigital number, since it uses as much as digits as its factorization.

2112123757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5880, while the sum is 31.

The square root of 2112123757 is about 45957.8476106094. The cubic root of 2112123757 is about 1283.0387917883.

Adding to 2112123757 its reverse (7573212112), we get a palindrome (9685335869).

The spelling of 2112123757 in words is "two billion, one hundred twelve million, one hundred twenty-three thousand, seven hundred fifty-seven".