2116221 has 8 divisors (see below), whose sum is σ = 2834304. Its totient is φ = 1404480.

The previous prime is 2116199. The next prime is 2116291. The reversal of 2116221 is 1226112.

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

It is not a de Polignac number, because 2116221 - 2¹⁴ = 2099837 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2116221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116291) 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, 741 + ... + 2186.

It is an arithmetic number, because the mean of its divisors is an integer number (354288).

2^2116221 is an apocalyptic number.

It is an amenable number.

2116221 is a deficient number, since it is larger than the sum of its proper divisors (718083).

2116221 is a wasteful number, since it uses less digits than its factorization.

2116221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171.

The product of its digits is 48, while the sum is 15.

The square root of 2116221 is about 1454.7236851031. The cubic root of 2116221 is about 128.3867898212.

The spelling of 2116221 in words is "two million, one hundred sixteen thousand, two hundred twenty-one".