212640132 has 12 divisors (see below), whose sum is σ = 496160336. Its totient is φ = 70880040.

The previous prime is 212640121. The next prime is 212640133. The reversal of 212640132 is 231046212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 212640099 and 212640108.

It is not an unprimeable number, because it can be changed into a prime (212640133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8859994 + ... + 8860017.

Almost surely, 2^212640132 is an apocalyptic number.

It is an amenable number.

212640132 is an abundant number, since it is smaller than the sum of its proper divisors (283520204).

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

212640132 is a wasteful number, since it uses less digits than its factorization.

212640132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17720018 (or 17720016 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 212640132 is about 14582.1854329178. The cubic root of 212640132 is about 596.8727398359.

Adding to 212640132 its reverse (231046212), we get a palindrome (443686344).

The spelling of 212640132 in words is "two hundred twelve million, six hundred forty thousand, one hundred thirty-two".