212107865 has 8 divisors (see below), whose sum is σ = 261408840. Its totient is φ = 165100032.

The previous prime is 212107843. The next prime is 212107871. The reversal of 212107865 is 568701212.

It can be written as a sum of positive squares in 4 ways, for example, as 21557449 + 190550416 = 4643^2 + 13804^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212107865 - 2²⁴ = 195330649 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 573080 + ... + 573449.

It is an arithmetic number, because the mean of its divisors is an integer number (32676105).

Almost surely, 2^212107865 is an apocalyptic number.

It is an amenable number.

212107865 is a deficient number, since it is larger than the sum of its proper divisors (49300975).

212107865 is a wasteful number, since it uses less digits than its factorization.

212107865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146571.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 212107865 is about 14563.9234068296. The cubic root of 212107865 is about 596.3743059996.

The spelling of 212107865 in words is "two hundred twelve million, one hundred seven thousand, eight hundred sixty-five".