212144220240 has 80 divisors (see below), whose sum is σ = 663467053248. Its totient is φ = 56071149568.

The previous prime is 212144220229. The next prime is 212144220251. The reversal of 212144220240 is 42022441212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (212144220229) and next prime (212144220251).

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 (24).

It is a self number, because there is not a number n which added to its sum of digits gives 212144220240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3884094 + ... + 3938333.

Almost surely, 2^212144220240 is an apocalyptic number.

212144220240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212144220240 is an abundant number, since it is smaller than the sum of its proper divisors (451322833008).

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

212144220240 is a wasteful number, since it uses less digits than its factorization.

212144220240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7822556 (or 7822550 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 212144220240 its reverse (42022441212), we get a palindrome (254166661452).

The spelling of 212144220240 in words is "two hundred twelve billion, one hundred forty-four million, two hundred twenty thousand, two hundred forty".