21744320363450 has 24 divisors (see below), whose sum is σ = 40447954770492. Its totient is φ = 8696971393920.

The previous prime is 21744320363443. The next prime is 21744320363453. The reversal of 21744320363450 is 5436302344712.

It can be written as a sum of positive squares in 6 ways, for example, as 16658650413001 + 5085669950449 = 4081501^2 + 2255143^2 .

It is not an unprimeable number, because it can be changed into a prime (21744320363453) 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, 18338189 + ... + 19487888.

Almost surely, 2^{21744320363450} is an apocalyptic number.

21744320363450 is a deficient number, since it is larger than the sum of its proper divisors (18703634407042).

21744320363450 is a wasteful number, since it uses less digits than its factorization.

21744320363450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37837586 (or 37837581 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 44.

The spelling of 21744320363450 in words is "twenty-one trillion, seven hundred forty-four billion, three hundred twenty million, three hundred sixty-three thousand, four hundred fifty".