212440660 has 24 divisors (see below), whose sum is σ = 461510280. Its totient is φ = 82045824.

The previous prime is 212440649. The next prime is 212440661. The reversal of 212440660 is 66044212.

It can be written as a sum of positive squares in 4 ways, for example, as 10061584 + 202379076 = 3172^2 + 14226^2 .

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212440661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182559 + ... + 183718.

It is an arithmetic number, because the mean of its divisors is an integer number (19229595).

Almost surely, 2^212440660 is an apocalyptic number.

212440660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212440660 is an abundant number, since it is smaller than the sum of its proper divisors (249069620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212440660 is a wasteful number, since it uses less digits than its factorization.

212440660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366315 (or 366313 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 212440660 is about 14575.3442497939. The cubic root of 212440660 is about 596.6860446807.

Adding to 212440660 its reverse (66044212), we get a palindrome (278484872).

The spelling of 212440660 in words is "two hundred twelve million, four hundred forty thousand, six hundred sixty".