21255050244 has 12 divisors (see below), whose sum is σ = 49595117264. Its totient is φ = 7085016744.

The previous prime is 21255050197. The next prime is 21255050261. The reversal of 21255050244 is 44205055212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885627082 + ... + 885627105.

Almost surely, 2^21255050244 is an apocalyptic number.

It is an amenable number.

21255050244 is an abundant number, since it is smaller than the sum of its proper divisors (28340067020).

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

21255050244 is a wasteful number, since it uses less digits than its factorization.

21255050244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771254194 (or 1771254192 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

The spelling of 21255050244 in words is "twenty-one billion, two hundred fifty-five million, fifty thousand, two hundred forty-four".