21092073650 has 24 divisors (see below), whose sum is σ = 39237840180. Its totient is φ = 8435413760.

The previous prime is 21092073649. The next prime is 21092073659. The reversal of 21092073650 is 5637029012.

21092073650 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 9936700489 + 11155373161 = 99683^2 + 105619^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21092073650.

It is not an unprimeable number, because it can be changed into a prime (21092073659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 296342 + ... + 360558.

Almost surely, 2^21092073650 is an apocalyptic number.

21092073650 is a deficient number, since it is larger than the sum of its proper divisors (18145766530).

21092073650 is a wasteful number, since it uses less digits than its factorization.

21092073650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70798 (or 70793 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 35.

The spelling of 21092073650 in words is "twenty-one billion, ninety-two million, seventy-three thousand, six hundred fifty".