21100133642244 has 12 divisors (see below), whose sum is σ = 49233645165264. Its totient is φ = 7033377880744.

The previous prime is 21100133642227. The next prime is 21100133642257. The reversal of 21100133642244 is 44224633100112.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 879172235082 + ... + 879172235105.

It is an arithmetic number, because the mean of its divisors is an integer number (4102803763772).

Almost surely, 2^{21100133642244} is an apocalyptic number.

It is an amenable number.

21100133642244 is an abundant number, since it is smaller than the sum of its proper divisors (28133511523020).

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

21100133642244 is a wasteful number, since it uses less digits than its factorization.

21100133642244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758344470194 (or 1758344470192 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 21100133642244 its reverse (44224633100112), we get a palindrome (65324766742356).

The spelling of 21100133642244 in words is "twenty-one trillion, one hundred billion, one hundred thirty-three million, six hundred forty-two thousand, two hundred forty-four".