2112021 has 32 divisors (see below), whose sum is σ = 3456000. Its totient is φ = 1268784.

The previous prime is 2112017. The next prime is 2112053. The reversal of 2112021 is 1202112.

It is not a de Polignac number, because 2112021 - 2² = 2112017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2111994 and 2112012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11710 + ... + 11888.

It is an arithmetic number, because the mean of its divisors is an integer number (108000).

2^2112021 is an apocalyptic number.

It is an amenable number.

2112021 is a deficient number, since it is larger than the sum of its proper divisors (1343979).

2112021 is a wasteful number, since it uses less digits than its factorization.

2112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2112021 is about 1453.2793950235. The cubic root of 2112021 is about 128.3017984397.

Adding to 2112021 its reverse (1202112), we get a palindrome (3314133).

Subtracting from 2112021 its reverse (1202112), we obtain a palindrome (909909).

The spelling of 2112021 in words is "two million, one hundred twelve thousand, twenty-one".