2128594921 has 2 divisors, whose sum is σ = 2128594922. Its totient is φ = 2128594920.

The previous prime is 2128594913. The next prime is 2128594967. The reversal of 2128594921 is 1294958212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1889119296 + 239475625 = 43464^2 + 15475^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128594921 - 2³ = 2128594913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2128534921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064297460 + 1064297461.

It is an arithmetic number, because the mean of its divisors is an integer number (1064297461).

Almost surely, 2^2128594921 is an apocalyptic number.

It is an amenable number.

2128594921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128594921 is an equidigital number, since it uses as much as digits as its factorization.

2128594921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 2128594921 is about 46136.6982021904. The cubic root of 2128594921 is about 1286.3653715296.

The spelling of 2128594921 in words is "two billion, one hundred twenty-eight million, five hundred ninety-four thousand, nine hundred twenty-one".