2194184645821 has 16 divisors (see below), whose sum is σ = 2617632417024. Its totient is φ = 1798295393664.

The previous prime is 2194184645791. The next prime is 2194184645837. The reversal of 2194184645821 is 1285464814912.

It is a happy number.

It is not a de Polignac number, because 2194184645821 - 2¹¹ = 2194184643773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2194184645321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2074906 + ... + 2948491.

It is an arithmetic number, because the mean of its divisors is an integer number (163602026064).

Almost surely, 2^{2194184645821} is an apocalyptic number.

It is an amenable number.

2194184645821 is a deficient number, since it is larger than the sum of its proper divisors (423447771203).

2194184645821 is a wasteful number, since it uses less digits than its factorization.

2194184645821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5026140.

The product of its digits is 4423680, while the sum is 55.

The spelling of 2194184645821 in words is "two trillion, one hundred ninety-four billion, one hundred eighty-four million, six hundred forty-five thousand, eight hundred twenty-one".