21903354844 has 48 divisors (see below), whose sum is σ = 43972992000. Its totient is φ = 9351599040.

The previous prime is 21903354841. The next prime is 21903354853. The reversal of 21903354844 is 44845330912.

It is a self number, because there is not a number n which added to its sum of digits gives 21903354844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21903354841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10956157 + ... + 10958155.

It is an arithmetic number, because the mean of its divisors is an integer number (916104000).

Almost surely, 2^21903354844 is an apocalyptic number.

It is an amenable number.

21903354844 is an abundant number, since it is smaller than the sum of its proper divisors (22069637156).

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

21903354844 is a wasteful number, since it uses less digits than its factorization.

21903354844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298 (or 3296 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 21903354844 in words is "twenty-one billion, nine hundred three million, three hundred fifty-four thousand, eight hundred forty-four".