21804756410 has 16 divisors (see below), whose sum is σ = 41557300776. Its totient is φ = 8208849408.

The previous prime is 21804756371. The next prime is 21804756419. The reversal of 21804756410 is 1465740812.

It can be written as a sum of positive squares in 4 ways, for example, as 18154059169 + 3650697241 = 134737^2 + 60421^2 .

It is not an unprimeable number, because it can be changed into a prime (21804756419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64131467 + ... + 64131806.

Almost surely, 2^21804756410 is an apocalyptic number.

21804756410 is a deficient number, since it is larger than the sum of its proper divisors (19752544366).

21804756410 is a wasteful number, since it uses less digits than its factorization.

21804756410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128263297.

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 21804756410 in words is "twenty-one billion, eight hundred four million, seven hundred fifty-six thousand, four hundred ten".