2213681 has 8 divisors (see below), whose sum is σ = 2333760. Its totient is φ = 2095632.

The previous prime is 2213677. The next prime is 2213699. The reversal of 2213681 is 1863122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2213681 - 2² = 2213677 is a prime.

It is a super-2 number, since 2×2213681² = 9800767139522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2213381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2066 + ... + 2948.

It is an arithmetic number, because the mean of its divisors is an integer number (291720).

2^2213681 is an apocalyptic number.

It is an amenable number.

2213681 is a deficient number, since it is larger than the sum of its proper divisors (120079).

2213681 is a wasteful number, since it uses less digits than its factorization.

2213681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015.

The product of its digits is 576, while the sum is 23.

The square root of 2213681 is about 1487.8444139089. The cubic root of 2213681 is about 130.3281846085.

The spelling of 2213681 in words is "two million, two hundred thirteen thousand, six hundred eighty-one".