21444505100 has 36 divisors (see below), whose sum is σ = 46743299904. Its totient is φ = 8539327680.

The previous prime is 21444505051. The next prime is 21444505123. The reversal of 21444505100 is 150544412.

It is a self number, because there is not a number n which added to its sum of digits gives 21444505100.

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 11 ways as a sum of consecutive naturals, for example, 458519 + ... + 503118.

Almost surely, 2^21444505100 is an apocalyptic number.

21444505100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444505100 is an abundant number, since it is smaller than the sum of its proper divisors (25298794804).

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

21444505100 is a wasteful number, since it uses less digits than its factorization.

21444505100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961874 (or 961867 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 21444505100 in words is "twenty-one billion, four hundred forty-four million, five hundred five thousand, one hundred".