217442211212 has 12 divisors (see below), whose sum is σ = 380539118400. Its totient is φ = 108716748816.

The previous prime is 217442211211. The next prime is 217442211221. The reversal of 217442211212 is 212112244712.

It is a super-2 number, since 2×217442211212² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217442211211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975587 + ... + 1177562.

It is an arithmetic number, because the mean of its divisors is an integer number (31711593200).

Almost surely, 2^217442211212 is an apocalyptic number.

It is an amenable number.

217442211212 is a deficient number, since it is larger than the sum of its proper divisors (163096907188).

217442211212 is a wasteful number, since it uses less digits than its factorization.

217442211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178400 (or 2178398 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

Adding to 217442211212 its reverse (212112244712), we get a palindrome (429554455924).

The spelling of 217442211212 in words is "two hundred seventeen billion, four hundred forty-two million, two hundred eleven thousand, two hundred twelve".