212255340 has 96 divisors (see below), whose sum is σ = 652651776. Its totient is φ = 51114240.

The previous prime is 212255297. The next prime is 212255341. The reversal of 212255340 is 43552212.

212255340 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 212255340.

It is not an unprimeable number, because it can be changed into a prime (212255341) 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 31 ways as a sum of consecutive naturals, for example, 106594 + ... + 108566.

It is an arithmetic number, because the mean of its divisors is an integer number (6798456).

Almost surely, 2^212255340 is an apocalyptic number.

212255340 is a gapful number since it is divisible by the number (20) 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 212255340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326325888).

212255340 is an abundant number, since it is smaller than the sum of its proper divisors (440396436).

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

212255340 is a wasteful number, since it uses less digits than its factorization.

212255340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159 (or 2157 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 212255340 is about 14568.9855515063. The cubic root of 212255340 is about 596.5124902912.

It can be divided in two parts, 21225 and 5340, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 212255340 in words is "two hundred twelve million, two hundred fifty-five thousand, three hundred forty".