212242140 has 96 divisors (see below), whose sum is σ = 720357120. Its totient is φ = 51451200.

The previous prime is 212242133. The next prime is 212242159. The reversal of 212242140 is 41242212.

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, 11926 + ... + 23805.

It is an arithmetic number, because the mean of its divisors is an integer number (7503720).

Almost surely, 2^212242140 is an apocalyptic number.

212242140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212242140 is an abundant number, since it is smaller than the sum of its proper divisors (508114980).

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

212242140 is a wasteful number, since it uses less digits than its factorization.

212242140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35760 (or 35752 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 212242140 is about 14568.5325273344. The cubic root of 212242140 is about 596.5001244804.

Adding to 212242140 its reverse (41242212), we get a palindrome (253484352).

The spelling of 212242140 in words is "two hundred twelve million, two hundred forty-two thousand, one hundred forty".