2111921 has 4 divisors (see below), whose sum is σ = 2413632. Its totient is φ = 1810212.

The previous prime is 2111917. The next prime is 2111933. The reversal of 2111921 is 1291112.

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 2111921 - 2² = 2111917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111921.

It is not an unprimeable number, because it can be changed into a prime (2111971) 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, 150845 + ... + 150858.

It is an arithmetic number, because the mean of its divisors is an integer number (603408).

2^2111921 is an apocalyptic number.

It is an amenable number.

2111921 is a deficient number, since it is larger than the sum of its proper divisors (301711).

2111921 is an equidigital number, since it uses as much as digits as its factorization.

2111921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301710.

The product of its digits is 36, while the sum is 17.

The square root of 2111921 is about 1453.2449896697. The cubic root of 2111921 is about 128.2997734626.

The spelling of 2111921 in words is "two million, one hundred eleven thousand, nine hundred twenty-one".