2215021 has 4 divisors (see below), whose sum is σ = 2241792. Its totient is φ = 2188252.

The previous prime is 2215013. The next prime is 2215051. The reversal of 2215021 is 1205122.

2215021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2215021 - 2³ = 2215013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2214992 and 2215010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13261 + ... + 13426.

It is an arithmetic number, because the mean of its divisors is an integer number (560448).

2^2215021 is an apocalyptic number.

It is an amenable number.

2215021 is a deficient number, since it is larger than the sum of its proper divisors (26771).

2215021 is an equidigital number, since it uses as much as digits as its factorization.

2215021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26770.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 2215021 is about 1488.2946616850. The cubic root of 2215021 is about 130.3544763432.

The spelling of 2215021 in words is "two million, two hundred fifteen thousand, twenty-one".