21850381736 has 16 divisors (see below), whose sum is σ = 41091041940. Its totient is φ = 10892770560.

The previous prime is 21850381711. The next prime is 21850381747. The reversal of 21850381736 is 63718305812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17665068100 + 4185313636 = 132910^2 + 64694^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

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, 4049675 + ... + 4055066.

Almost surely, 2^21850381736 is an apocalyptic number.

It is an amenable number.

21850381736 is a deficient number, since it is larger than the sum of its proper divisors (19240660204).

21850381736 is a wasteful number, since it uses less digits than its factorization.

21850381736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8105084 (or 8105080 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 21850381736 in words is "twenty-one billion, eight hundred fifty million, three hundred eighty-one thousand, seven hundred thirty-six".