21738730224308 has 48 divisors (see below), whose sum is σ = 41086625318928. Its totient is φ = 10026476544000.

The previous prime is 21738730224217. The next prime is 21738730224313. The reversal of 21738730224308 is 80342203783712.

It can be written as a sum of positive squares in 8 ways, for example, as 1288184140324 + 20450546083984 = 1134982^2 + 4522228^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8159633 + ... + 10490808.

It is an arithmetic number, because the mean of its divisors is an integer number (855971360811).

Almost surely, 2^{21738730224308} is an apocalyptic number.

It is an amenable number.

21738730224308 is a deficient number, since it is larger than the sum of its proper divisors (19347895094620).

21738730224308 is a wasteful number, since it uses less digits than its factorization.

21738730224308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18650804 (or 18650802 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 50.

The spelling of 21738730224308 in words is "twenty-one trillion, seven hundred thirty-eight billion, seven hundred thirty million, two hundred twenty-four thousand, three hundred eight".