2195118921 has 4 divisors (see below), whose sum is σ = 2926825232. Its totient is φ = 1463412612.

The previous prime is 2195118917. The next prime is 2195118929. The reversal of 2195118921 is 1298115912.

It is a happy number.

2195118921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 2195118921 - 2² = 2195118917 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 2195118921.

It is not an unprimeable number, because it can be changed into a prime (2195118929) 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, 365853151 + ... + 365853156.

It is an arithmetic number, because the mean of its divisors is an integer number (731706308).

Almost surely, 2^2195118921 is an apocalyptic number.

It is an amenable number.

2195118921 is a deficient number, since it is larger than the sum of its proper divisors (731706311).

2195118921 is an equidigital number, since it uses as much as digits as its factorization.

2195118921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731706310.

The product of its digits is 12960, while the sum is 39.

The square root of 2195118921 is about 46852.0962284507. The cubic root of 2195118921 is about 1299.6288725606.

The spelling of 2195118921 in words is "two billion, one hundred ninety-five million, one hundred eighteen thousand, nine hundred twenty-one".