212104340 has 72 divisors (see below), whose sum is σ = 520474752. Its totient is φ = 72606240.

The previous prime is 212104309. The next prime is 212104363. The reversal of 212104340 is 43401212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 335825 + ... + 336455.

It is an arithmetic number, because the mean of its divisors is an integer number (7228816).

Almost surely, 2^212104340 is an apocalyptic number.

212104340 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 212104340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260237376).

212104340 is an abundant number, since it is smaller than the sum of its proper divisors (308370412).

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

212104340 is an frugal number, since it uses more digits than its factorization.

212104340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212104340 is about 14563.8023881128. The cubic root of 212104340 is about 596.3710022857.

Adding to 212104340 its reverse (43401212), we get a palindrome (255505552).

The spelling of 212104340 in words is "two hundred twelve million, one hundred four thousand, three hundred forty".