212133240 has 96 divisors (see below), whose sum is σ = 752122800. Its totient is φ = 51425280.

The previous prime is 212133239. The next prime is 212133241. The reversal of 212133240 is 42331212.

212133240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (212133239) and next prime (212133241).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212133241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22825 + ... + 30744.

Almost surely, 2^212133240 is an apocalyptic number.

212133240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212133240 is an abundant number, since it is smaller than the sum of its proper divisors (539989560).

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

212133240 is a wasteful number, since it uses less digits than its factorization.

212133240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53597 (or 53590 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 212133240 is about 14564.7945402604. The cubic root of 212133240 is about 596.3980869732.

Adding to 212133240 its reverse (42331212), we get a palindrome (254464452).

The spelling of 212133240 in words is "two hundred twelve million, one hundred thirty-three thousand, two hundred forty".