2217381 has 8 divisors (see below), whose sum is σ = 3025440. Its totient is φ = 1443792.

The previous prime is 2217379. The next prime is 2217409. The reversal of 2217381 is 1837122.

2217381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2217381 - 2¹ = 2217379 is a prime.

It is a super-2 number, since 2×2217381² = 9833556998322, which contains 22 as substring.

2217381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217301) 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 7 ways as a sum of consecutive naturals, for example, 8466 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (378180).

2^2217381 is an apocalyptic number.

It is an amenable number.

2217381 is a deficient number, since it is larger than the sum of its proper divisors (808059).

2217381 is a wasteful number, since it uses less digits than its factorization.

2217381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17235.

The product of its digits is 672, while the sum is 24.

The square root of 2217381 is about 1489.0873043579. The cubic root of 2217381 is about 130.4007554186.

The spelling of 2217381 in words is "two million, two hundred seventeen thousand, three hundred eighty-one".