212211340 has 96 divisors (see below), whose sum is σ = 537352704. Its totient is φ = 69442560.

The previous prime is 212211331. The next prime is 212211341. The reversal of 212211340 is 43112212.

212211340 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (212211341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84787 + ... + 87253.

It is an arithmetic number, because the mean of its divisors is an integer number (5597424).

Almost surely, 2^212211340 is an apocalyptic number.

212211340 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 212211340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268676352).

212211340 is an abundant number, since it is smaller than the sum of its proper divisors (325141364).

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

212211340 is a wasteful number, since it uses less digits than its factorization.

212211340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527 (or 2525 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 212211340 is about 14567.4754161454. The cubic root of 212211340 is about 596.4712689280.

Adding to 212211340 its reverse (43112212), we get a palindrome (255323552).

The spelling of 212211340 in words is "two hundred twelve million, two hundred eleven thousand, three hundred forty".