212144240 has 80 divisors (see below), whose sum is σ = 614960640. Its totient is φ = 66120960.

The previous prime is 212144239. The next prime is 212144243. The reversal of 212144240 is 42441212.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212144243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11060 + ... + 23379.

It is an arithmetic number, because the mean of its divisors is an integer number (7687008).

Almost surely, 2^212144240 is an apocalyptic number.

212144240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212144240 is an abundant number, since it is smaller than the sum of its proper divisors (402816400).

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

212144240 is a wasteful number, since it uses less digits than its factorization.

212144240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34470 (or 34464 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 212144240 is about 14565.1721582685. The cubic root of 212144240 is about 596.4083953774.

Adding to 212144240 its reverse (42441212), we get a palindrome (254585452).

The spelling of 212144240 in words is "two hundred twelve million, one hundred forty-four thousand, two hundred forty".