2126320891 has 2 divisors, whose sum is σ = 2126320892. Its totient is φ = 2126320890.

The previous prime is 2126320877. The next prime is 2126320901. The reversal of 2126320891 is 1980236212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2126320891 - 2⁹ = 2126320379 is a prime.

It is not a weakly prime, because it can be changed into another prime (2126320841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063160445 + 1063160446.

It is an arithmetic number, because the mean of its divisors is an integer number (1063160446).

Almost surely, 2^2126320891 is an apocalyptic number.

2126320891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126320891 is an equidigital number, since it uses as much as digits as its factorization.

2126320891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 2126320891 is about 46112.0471352119. The cubic root of 2126320891 is about 1285.9071231118.

The spelling of 2126320891 in words is "two billion, one hundred twenty-six million, three hundred twenty thousand, eight hundred ninety-one".