212865841 has 4 divisors (see below), whose sum is σ = 212920384. Its totient is φ = 212811300.

The previous prime is 212865833. The next prime is 212865869. The reversal of 212865841 is 148568212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212865841 - 2³ = 212865833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212865841.

It is not an unprimeable number, because it can be changed into a prime (212865241) 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 3 ways as a sum of consecutive naturals, for example, 20925 + ... + 29386.

It is an arithmetic number, because the mean of its divisors is an integer number (53230096).

Almost surely, 2^212865841 is an apocalyptic number.

It is an amenable number.

212865841 is a deficient number, since it is larger than the sum of its proper divisors (54543).

212865841 is an equidigital number, since it uses as much as digits as its factorization.

212865841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54542.

The product of its digits is 30720, while the sum is 37.

The square root of 212865841 is about 14589.9225837562. The cubic root of 212865841 is about 597.0838506762.

The spelling of 212865841 in words is "two hundred twelve million, eight hundred sixty-five thousand, eight hundred forty-one".