21849698555918 has 16 divisors (see below), whose sum is σ = 34533580882320. Its totient is φ = 10339640156736.

The previous prime is 21849698555917. The next prime is 21849698555941. The reversal of 21849698555918 is 81955589694812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849698555917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283768055 + ... + 283845042.

It is an arithmetic number, because the mean of its divisors is an integer number (2158348805145).

Almost surely, 2^{21849698555918} is an apocalyptic number.

21849698555918 is a deficient number, since it is larger than the sum of its proper divisors (12683882326402).

21849698555918 is a wasteful number, since it uses less digits than its factorization.

21849698555918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567614131.

The product of its digits is 2239488000, while the sum is 80.

The spelling of 21849698555918 in words is "twenty-one trillion, eight hundred forty-nine billion, six hundred ninety-eight million, five hundred fifty-five thousand, nine hundred eighteen".