212424540 has 48 divisors (see below), whose sum is σ = 597811200. Its totient is φ = 56358720.

The previous prime is 212424539. The next prime is 212424551. The reversal of 212424540 is 45424212.

It is a happy number.

212424540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 212424540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3045 + ... + 20835.

It is an arithmetic number, because the mean of its divisors is an integer number (12454400).

Almost surely, 2^212424540 is an apocalyptic number.

212424540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212424540 is an abundant number, since it is smaller than the sum of its proper divisors (385386660).

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

212424540 is a wasteful number, since it uses less digits than its factorization.

212424540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18002 (or 18000 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 212424540 is about 14574.7912506492. The cubic root of 212424540 is about 596.6709521173.

Adding to 212424540 its reverse (45424212), we get a palindrome (257848752).

The spelling of 212424540 in words is "two hundred twelve million, four hundred twenty-four thousand, five hundred forty".