212204340 has 96 divisors (see below), whose sum is σ = 664661760. Its totient is φ = 56204928.

The previous prime is 212204329. The next prime is 212204383. The reversal of 212204340 is 43402212.

212204340 is a `hidden beast` number, since 212 + 20 + 434 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83529 + ... + 86031.

It is an arithmetic number, because the mean of its divisors is an integer number (6923560).

Almost surely, 2^212204340 is an apocalyptic number.

212204340 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 212204340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332330880).

212204340 is an abundant number, since it is smaller than the sum of its proper divisors (452457420).

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

212204340 is a wasteful number, since it uses less digits than its factorization.

212204340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678 (or 2670 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 212204340 is about 14567.2351529039. The cubic root of 212204340 is about 596.4647104585.

Adding to 212204340 its reverse (43402212), we get a palindrome (255606552).

The spelling of 212204340 in words is "two hundred twelve million, two hundred four thousand, three hundred forty".