2217806997 has 16 divisors (see below), whose sum is σ = 3386304000. Its totient is φ = 1264772592.

The previous prime is 2217806971. The next prime is 2217807013. The reversal of 2217806997 is 7996087122.

It is not a de Polignac number, because 2217806997 - 2²⁷ = 2083589269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217806917) 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 15 ways as a sum of consecutive naturals, for example, 95343 + ... + 116300.

It is an arithmetic number, because the mean of its divisors is an integer number (211644000).

Almost surely, 2^2217806997 is an apocalyptic number.

It is an amenable number.

2217806997 is a deficient number, since it is larger than the sum of its proper divisors (1168497003).

2217806997 is a wasteful number, since it uses less digits than its factorization.

2217806997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212152.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 2217806997 is about 47093.5982592114. The cubic root of 2217806997 is about 1304.0910562599.

The spelling of 2217806997 in words is "two billion, two hundred seventeen million, eight hundred six thousand, nine hundred ninety-seven".