21850186688 has 56 divisors (see below), whose sum is σ = 47462572080. Its totient is φ = 9897912320.

The previous prime is 21850186679. The next prime is 21850186693. The reversal of 21850186688 is 88668105812.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 153308 + ... + 259236.

It is an arithmetic number, because the mean of its divisors is an integer number (847545930).

Almost surely, 2^21850186688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21850186688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23731286040).

21850186688 is an abundant number, since it is smaller than the sum of its proper divisors (25612385392).

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

21850186688 is a wasteful number, since it uses less digits than its factorization.

21850186688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106245 (or 106235 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 53.

The spelling of 21850186688 in words is "twenty-one billion, eight hundred fifty million, one hundred eighty-six thousand, six hundred eighty-eight".