2194021973 has 24 divisors (see below), whose sum is σ = 2646222264. Its totient is φ = 1806330240.

The previous prime is 2194021969. The next prime is 2194022027. The reversal of 2194021973 is 3791204912.

It can be written as a sum of positive squares in 4 ways, for example, as 308986084 + 1885035889 = 17578^2 + 43417^2 .

It is not a de Polignac number, because 2194021973 - 2² = 2194021969 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2194021913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70211 + ... + 96527.

It is an arithmetic number, because the mean of its divisors is an integer number (110259261).

Almost surely, 2^2194021973 is an apocalyptic number.

It is an amenable number.

2194021973 is a deficient number, since it is larger than the sum of its proper divisors (452200291).

2194021973 is a wasteful number, since it uses less digits than its factorization.

2194021973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26405 (or 26394 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 2194021973 is about 46840.3882669647. The cubic root of 2194021973 is about 1299.4123523505.

The spelling of 2194021973 in words is "two billion, one hundred ninety-four million, twenty-one thousand, nine hundred seventy-three".