212404556 has 48 divisors (see below), whose sum is σ = 460267584. Its totient is φ = 83517696.

The previous prime is 212404547. The next prime is 212404561. The reversal of 212404556 is 655404212.

212404556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 61286 + ... + 64658.

It is an arithmetic number, because the mean of its divisors is an integer number (9588908).

Almost surely, 2^212404556 is an apocalyptic number.

212404556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212404556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230133792).

212404556 is an abundant number, since it is smaller than the sum of its proper divisors (247863028).

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

212404556 is a wasteful number, since it uses less digits than its factorization.

212404556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570 (or 3568 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 212404556 is about 14574.1056672442. The cubic root of 212404556 is about 596.6522407728.

Adding to 212404556 its reverse (655404212), we get a palindrome (867808768).

The spelling of 212404556 in words is "two hundred twelve million, four hundred four thousand, five hundred fifty-six".