212216697 has 108 divisors (see below), whose sum is σ = 405644148. Its totient is φ = 106444800.

The previous prime is 212216659. The next prime is 212216723. The reversal of 212216697 is 796612212.

It can be written as a sum of positive squares in 2 ways, for example, as 44876601 + 167340096 = 6699^2 + 12936^2 .

It is not a de Polignac number, because 212216697 - 2⁸ = 212216441 is a prime.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (212216617) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 2187753 + ... + 2187849.

Almost surely, 2^212216697 is an apocalyptic number.

It is an amenable number.

212216697 is a deficient number, since it is larger than the sum of its proper divisors (193427451).

212216697 is a wasteful number, since it uses less digits than its factorization.

212216697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 159 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 212216697 is about 14567.6592834951. The cubic root of 212216697 is about 596.4762879335.

The spelling of 212216697 in words is "two hundred twelve million, two hundred sixteen thousand, six hundred ninety-seven".