2206621 has 2 divisors, whose sum is σ = 2206622. Its totient is φ = 2206620.

The previous prime is 2206619. The next prime is 2206627. The reversal of 2206621 is 1266022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 343396 = 1365^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2206621 - 2¹ = 2206619 is a prime.

Together with 2206619, it forms a pair of twin primes.

It is equal to p₁₆₃₁₁₇ and since 2206621 and 163117 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2206627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1103310 + 1103311.

It is an arithmetic number, because the mean of its divisors is an integer number (1103311).

2^2206621 is an apocalyptic number.

It is an amenable number.

2206621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2206621 is an equidigital number, since it uses as much as digits as its factorization.

2206621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2206621 is about 1485.4699593058. The cubic root of 2206621 is about 130.1894869847.

The spelling of 2206621 in words is "two million, two hundred six thousand, six hundred twenty-one".