2216081 has 4 divisors (see below), whose sum is σ = 2532672. Its totient is φ = 1899492.

The previous prime is 2216057. The next prime is 2216083. The reversal of 2216081 is 1806122.

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 de Polignac number, because none of the positive numbers 2^k-2216081 is a prime.

It is a super-2 number, since 2×2216081² = 9822029997122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2216083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158285 + ... + 158298.

It is an arithmetic number, because the mean of its divisors is an integer number (633168).

2^2216081 is an apocalyptic number.

It is an amenable number.

2216081 is a deficient number, since it is larger than the sum of its proper divisors (316591).

2216081 is an equidigital number, since it uses as much as digits as its factorization.

2216081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316590.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 2216081 is about 1488.6507313672. The cubic root of 2216081 is about 130.3752667721.

The spelling of 2216081 in words is "two million, two hundred sixteen thousand, eighty-one".