2104123221 has 12 divisors (see below), whose sum is σ = 3067695072. Its totient is φ = 1389638376.

The previous prime is 2104123187. The next prime is 2104123253. The reversal of 2104123221 is 1223214012.

It is a happy number.

It is not a de Polignac number, because 2104123221 - 2⁷ = 2104123093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2104123194 and 2104123203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2104123271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1091521 + ... + 1093446.

It is an arithmetic number, because the mean of its divisors is an integer number (255641256).

Almost surely, 2^2104123221 is an apocalyptic number.

It is an amenable number.

2104123221 is a deficient number, since it is larger than the sum of its proper divisors (963571851).

2104123221 is a wasteful number, since it uses less digits than its factorization.

2104123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185080 (or 2185077 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2104123221 is about 45870.7229177828. The cubic root of 2104123221 is about 1281.4167298995.

Adding to 2104123221 its reverse (1223214012), we get a palindrome (3327337233).

The spelling of 2104123221 in words is "two billion, one hundred four million, one hundred twenty-three thousand, two hundred twenty-one".