2121107 has 4 divisors (see below), whose sum is σ = 2245896. Its totient is φ = 1996320.

The previous prime is 2121043. The next prime is 2121121. The reversal of 2121107 is 7011212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121107 - 2⁶ = 2121043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121091 and 2121100.

It is not an unprimeable number, because it can be changed into a prime (2121127) 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, 62369 + ... + 62402.

It is an arithmetic number, because the mean of its divisors is an integer number (561474).

2^2121107 is an apocalyptic number.

2121107 is a deficient number, since it is larger than the sum of its proper divisors (124789).

2121107 is a wasteful number, since it uses less digits than its factorization.

2121107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124788.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 2121107 is about 1456.4020736047. The cubic root of 2121107 is about 128.4855217428.

Adding to 2121107 its reverse (7011212), we get a palindrome (9132319).

The spelling of 2121107 in words is "two million, one hundred twenty-one thousand, one hundred seven".