2164994821 has 16 divisors (see below), whose sum is σ = 2377539648. Its totient is φ = 1955116800.

The previous prime is 2164994809. The next prime is 2164994837. The reversal of 2164994821 is 1284994612.

It is a cyclic number.

It is not a de Polignac number, because 2164994821 - 2⁹ = 2164994309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164994891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1449351 + ... + 1450843.

It is an arithmetic number, because the mean of its divisors is an integer number (148596228).

Almost surely, 2^2164994821 is an apocalyptic number.

It is an amenable number.

2164994821 is a deficient number, since it is larger than the sum of its proper divisors (212544827).

2164994821 is a wasteful number, since it uses less digits than its factorization.

2164994821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292.

The product of its digits is 248832, while the sum is 46.

The square root of 2164994821 is about 46529.5048437011. The cubic root of 2164994821 is about 1293.6564373173.

The spelling of 2164994821 in words is "two billion, one hundred sixty-four million, nine hundred ninety-four thousand, eight hundred twenty-one".