212217838 has 16 divisors (see below), whose sum is σ = 364032000. Its totient is φ = 90893016.

The previous prime is 212217823. The next prime is 212217839. The reversal of 212217838 is 838712212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212217839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24195 + ... + 31777.

It is an arithmetic number, because the mean of its divisors is an integer number (22752000).

Almost surely, 2^212217838 is an apocalyptic number.

212217838 is a deficient number, since it is larger than the sum of its proper divisors (151814162).

212217838 is a wasteful number, since it uses less digits than its factorization.

212217838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9591.

The product of its digits is 10752, while the sum is 34.

The square root of 212217838 is about 14567.6984455335. The cubic root of 212217838 is about 596.4773569324.

The spelling of 212217838 in words is "two hundred twelve million, two hundred seventeen thousand, eight hundred thirty-eight".