2115021 has 16 divisors (see below), whose sum is σ = 3020544. Its totient is φ = 1311744.

The previous prime is 2115017. The next prime is 2115049. The reversal of 2115021 is 1205112.

It is not a de Polignac number, because 2115021 - 2² = 2115017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2114988 and 2115006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5580 + ... + 5946.

It is an arithmetic number, because the mean of its divisors is an integer number (188784).

2^2115021 is an apocalyptic number.

It is an amenable number.

2115021 is a deficient number, since it is larger than the sum of its proper divisors (905523).

2115021 is a wasteful number, since it uses less digits than its factorization.

2115021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 2115021 is about 1454.3111771557. The cubic root of 2115021 is about 128.3625180528.

Subtracting from 2115021 its reverse (1205112), we obtain a palindrome (909909).

The spelling of 2115021 in words is "two million, one hundred fifteen thousand, twenty-one".