2104221 has 16 divisors (see below), whose sum is σ = 3242624. Its totient is φ = 1188864.

The previous prime is 2104217. The next prime is 2104229. The reversal of 2104221 is 1224012.

It is not a de Polignac number, because 2104221 - 2² = 2104217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2104197 and 2104206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2104229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1521 + ... + 2553.

It is an arithmetic number, because the mean of its divisors is an integer number (202664).

2^2104221 is an apocalyptic number.

2104221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2104221 is a deficient number, since it is larger than the sum of its proper divisors (1138403).

2104221 is a wasteful number, since it uses less digits than its factorization.

2104221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2104221 is about 1450.5933268839. The cubic root of 2104221 is about 128.1436578817.

Adding to 2104221 its reverse (1224012), we get a palindrome (3328233).

The spelling of 2104221 in words is "two million, one hundred four thousand, two hundred twenty-one".