2123081 has 2 divisors, whose sum is σ = 2123082. Its totient is φ = 2123080.

The previous prime is 2123063. The next prime is 2123083. The reversal of 2123081 is 1803212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1713481 + 409600 = 1309^2 + 640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123081 is a prime.

It is a super-2 number, since 2×2123081² = 9014945865122, which contains 22 as substring.

Together with 2123083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2123083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061540 + 1061541.

It is an arithmetic number, because the mean of its divisors is an integer number (1061541).

2^2123081 is an apocalyptic number.

It is an amenable number.

2123081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123081 is an equidigital number, since it uses as much as digits as its factorization.

2123081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2123081 is about 1457.0796134735. The cubic root of 2123081 is about 128.5253675687.

Adding to 2123081 its reverse (1803212), we get a palindrome (3926293).

The spelling of 2123081 in words is "two million, one hundred twenty-three thousand, eighty-one".