212440065 has 16 divisors (see below), whose sum is σ = 348195456. Its totient is φ = 110537600.

The previous prime is 212440043. The next prime is 212440069. The reversal of 212440065 is 560044212.

It is not a de Polignac number, because 212440065 - 2²⁰ = 211391489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212440069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172101 + ... + 173330.

It is an arithmetic number, because the mean of its divisors is an integer number (21762216).

Almost surely, 2^212440065 is an apocalyptic number.

It is an amenable number.

212440065 is a deficient number, since it is larger than the sum of its proper divisors (135755391).

212440065 is a wasteful number, since it uses less digits than its factorization.

212440065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345480.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 212440065 is about 14575.3238385979. The cubic root of 212440065 is about 596.6854876176.

Adding to 212440065 its reverse (560044212), we get a palindrome (772484277).

The spelling of 212440065 in words is "two hundred twelve million, four hundred forty thousand, sixty-five".