21002241996 has 18 divisors (see below), whose sum is σ = 53089000692. Its totient is φ = 7000747320.

The previous prime is 21002241991. The next prime is 21002242007. The reversal of 21002241996 is 69914220012.

21002241996 is a `hidden beast` number, since 210 + 0 + 22 + 419 + 9 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 583395611 = 21002241996 / (2 + 1 + 0 + 0 + 2 + 2 + 4 + 1 + 9 + 9 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 21002241996.

It is not an unprimeable number, because it can be changed into a prime (21002241991) 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 5 ways as a sum of consecutive naturals, for example, 291697770 + ... + 291697841.

Almost surely, 2^21002241996 is an apocalyptic number.

It is an amenable number.

21002241996 is an abundant number, since it is smaller than the sum of its proper divisors (32086758696).

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

21002241996 is a wasteful number, since it uses less digits than its factorization.

21002241996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583395621 (or 583395616 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 21002241996 in words is "twenty-one billion, two million, two hundred forty-one thousand, nine hundred ninety-six".