212107917 has 12 divisors (see below), whose sum is σ = 328983936. Its totient is φ = 121204440.

The previous prime is 212107913. The next prime is 212107933. The reversal of 212107917 is 719701212.

It is a happy number.

It is not a de Polignac number, because 212107917 - 2² = 212107913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212107913) 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 11 ways as a sum of consecutive naturals, for example, 721309 + ... + 721602.

It is an arithmetic number, because the mean of its divisors is an integer number (27415328).

Almost surely, 2^212107917 is an apocalyptic number.

It is an amenable number.

212107917 is a deficient number, since it is larger than the sum of its proper divisors (116876019).

212107917 is a wasteful number, since it uses less digits than its factorization.

212107917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442928 (or 1442921 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 30.

The square root of 212107917 is about 14563.9251920627. The cubic root of 212107917 is about 596.3743547350.

The spelling of 212107917 in words is "two hundred twelve million, one hundred seven thousand, nine hundred seventeen".