21100223144 has 64 divisors (see below), whose sum is σ = 53119463040. Its totient is φ = 7588488960.

The previous prime is 21100223143. The next prime is 21100223147. The reversal of 21100223144 is 44132200112.

It is not an unprimeable number, because it can be changed into a prime (21100223141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309439 + ... + 1325454.

It is an arithmetic number, because the mean of its divisors is an integer number (829991610).

Almost surely, 2^21100223144 is an apocalyptic number.

It is an amenable number.

21100223144 is an abundant number, since it is smaller than the sum of its proper divisors (32019239896).

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

21100223144 is a wasteful number, since it uses less digits than its factorization.

21100223144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634930 (or 2634926 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21100223144 its reverse (44132200112), we get a palindrome (65232423256).

The spelling of 21100223144 in words is "twenty-one billion, one hundred million, two hundred twenty-three thousand, one hundred forty-four".