2206521 has 10 divisors (see below), whose sum is σ = 3296282. Its totient is φ = 1470960.

The previous prime is 2206517. The next prime is 2206543. The reversal of 2206521 is 1256022.

2206521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2205225 + 1296 = 1485^2 + 36^2 .

It is not a de Polignac number, because 2206521 - 2² = 2206517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2206494 and 2206503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2206591) 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 9 ways as a sum of consecutive naturals, for example, 13540 + ... + 13701.

2^2206521 is an apocalyptic number.

It is an amenable number.

2206521 is a deficient number, since it is larger than the sum of its proper divisors (1089761).

2206521 is an equidigital number, since it uses as much as digits as its factorization.

2206521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27253 (or 27244 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2206521 is about 1485.4362995430. The cubic root of 2206521 is about 130.1875203057.

The spelling of 2206521 in words is "two million, two hundred six thousand, five hundred twenty-one".