215000243440 has 20 divisors (see below), whose sum is σ = 499875566184. Its totient is φ = 86000097344.

The previous prime is 215000243429. The next prime is 215000243449. The reversal of 215000243440 is 44342000512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215000243449) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1343751442 + ... + 1343751601.

Almost surely, 2^215000243440 is an apocalyptic number.

215000243440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215000243440 is an abundant number, since it is smaller than the sum of its proper divisors (284875322744).

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

215000243440 is a wasteful number, since it uses less digits than its factorization.

215000243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687503056 (or 2687503050 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 215000243440 its reverse (44342000512), we get a palindrome (259342243952).

The spelling of 215000243440 in words is "two hundred fifteen billion, two hundred forty-three thousand, four hundred forty".