2164440421 has 8 divisors (see below), whose sum is σ = 2542839264. Its totient is φ = 1816313520.

The previous prime is 2164440413. The next prime is 2164440431. The reversal of 2164440421 is 1240444612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2164440421 - 2³ = 2164440413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2164440421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164440401) 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 in 7 ways as a sum of consecutive naturals, for example, 7567831 + ... + 7568116.

It is an arithmetic number, because the mean of its divisors is an integer number (317854908).

Almost surely, 2^2164440421 is an apocalyptic number.

It is an amenable number.

2164440421 is a deficient number, since it is larger than the sum of its proper divisors (378398843).

2164440421 is a wasteful number, since it uses less digits than its factorization.

2164440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15135971.

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 2164440421 is about 46523.5469520543. The cubic root of 2164440421 is about 1293.5460037418.

The spelling of 2164440421 in words is "two billion, one hundred sixty-four million, four hundred forty thousand, four hundred twenty-one".