2108164421 has 4 divisors (see below), whose sum is σ = 2299815744. Its totient is φ = 1916513100.

The previous prime is 2108164403. The next prime is 2108164427. The reversal of 2108164421 is 1244618012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2108164421 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 (2108164427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95825645 + ... + 95825666.

It is an arithmetic number, because the mean of its divisors is an integer number (574953936).

Almost surely, 2^2108164421 is an apocalyptic number.

It is an amenable number.

2108164421 is a deficient number, since it is larger than the sum of its proper divisors (191651323).

2108164421 is a wasteful number, since it uses less digits than its factorization.

2108164421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191651322.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 2108164421 is about 45914.7516708955. The cubic root of 2108164421 is about 1282.2365724990.

The spelling of 2108164421 in words is "two billion, one hundred eight million, one hundred sixty-four thousand, four hundred twenty-one".