2104111021 has 4 divisors (see below), whose sum is σ = 2155430844. Its totient is φ = 2052791200.

The previous prime is 2104111007. The next prime is 2104111027. The reversal of 2104111021 is 1201114012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27941796 + 2076169225 = 5286^2 + 45565^2 .

It is a cyclic number.

It is not a de Polignac number, because 2104111021 - 2¹⁷ = 2103979949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2104110992 and 2104111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2104111027) 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, 25659850 + ... + 25659931.

It is an arithmetic number, because the mean of its divisors is an integer number (538857711).

Almost surely, 2^2104111021 is an apocalyptic number.

It is an amenable number.

2104111021 is a deficient number, since it is larger than the sum of its proper divisors (51319823).

2104111021 is an equidigital number, since it uses as much as digits as its factorization.

2104111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51319822.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2104111021 is about 45870.5899351643. The cubic root of 2104111021 is about 1281.4142532837.

Adding to 2104111021 its reverse (1201114012), we get a palindrome (3305225033).

The spelling of 2104111021 in words is "two billion, one hundred four million, one hundred eleven thousand, twenty-one".