2121109 has 4 divisors (see below), whose sum is σ = 2157120. Its totient is φ = 2085100.

The previous prime is 2121043. The next prime is 2121121. The reversal of 2121109 is 9011212.

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 not a de Polignac number, because 2121109 - 2⁷ = 2120981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121092 and 2121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121199) 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, 17917 + ... + 18034.

It is an arithmetic number, because the mean of its divisors is an integer number (539280).

2^2121109 is an apocalyptic number.

It is an amenable number.

2121109 is a deficient number, since it is larger than the sum of its proper divisors (36011).

2121109 is an equidigital number, since it uses as much as digits as its factorization.

2121109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36010.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 2121109 is about 1456.4027602281. The cubic root of 2121109 is about 128.4855621260.

The spelling of 2121109 in words is "two million, one hundred twenty-one thousand, one hundred nine".