212130340 has 12 divisors (see below), whose sum is σ = 445473756. Its totient is φ = 84852128.

The previous prime is 212130337. The next prime is 212130349. The reversal of 212130340 is 43031212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55980324 + 156150016 = 7482^2 + 12496^2 .

It is a super-2 number, since 2×212130340² = 89998562297031200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212130349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5303239 + ... + 5303278.

It is an arithmetic number, because the mean of its divisors is an integer number (37122813).

Almost surely, 2^212130340 is an apocalyptic number.

212130340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212130340 is an abundant number, since it is smaller than the sum of its proper divisors (233343416).

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

212130340 is a wasteful number, since it uses less digits than its factorization.

212130340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606526 (or 10606524 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 212130340 is about 14564.6949847911. The cubic root of 212130340 is about 596.3953692436.

Adding to 212130340 its reverse (43031212), we get a palindrome (255161552).

The spelling of 212130340 in words is "two hundred twelve million, one hundred thirty thousand, three hundred forty".