2126358821 has 2 divisors, whose sum is σ = 2126358822. Its totient is φ = 2126358820.

The previous prime is 2126358791. The next prime is 2126358847. The reversal of 2126358821 is 1288536212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2124288100 + 2070721 = 46090^2 + 1439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2126358821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2126358881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063179410 + 1063179411.

It is an arithmetic number, because the mean of its divisors is an integer number (1063179411).

Almost surely, 2^2126358821 is an apocalyptic number.

It is an amenable number.

2126358821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126358821 is an equidigital number, since it uses as much as digits as its factorization.

2126358821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 38.

The square root of 2126358821 is about 46112.4584141856. The cubic root of 2126358821 is about 1285.9147692087.

The spelling of 2126358821 in words is "two billion, one hundred twenty-six million, three hundred fifty-eight thousand, eight hundred twenty-one".