2194582021 has 2 divisors, whose sum is σ = 2194582022. Its totient is φ = 2194582020.

The previous prime is 2194581979. The next prime is 2194582067. The reversal of 2194582021 is 1202854912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2191644225 + 2937796 = 46815^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2194582021 - 2²¹ = 2192484869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2194582121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097291010 + 1097291011.

It is an arithmetic number, because the mean of its divisors is an integer number (1097291011).

Almost surely, 2^2194582021 is an apocalyptic number.

It is an amenable number.

2194582021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2194582021 is an equidigital number, since it uses as much as digits as its factorization.

2194582021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 2194582021 is about 46846.3661450918. The cubic root of 2194582021 is about 1299.5229059952.

The spelling of 2194582021 in words is "two billion, one hundred ninety-four million, five hundred eighty-two thousand, twenty-one".