21424668144448 has 14 divisors (see below), whose sum is σ = 42514575849266. Its totient is φ = 10712334072192.

The previous prime is 21424668144413. The next prime is 21424668144479. The reversal of 21424668144448 is 84444186642412.

It can be written as a sum of positive squares in only one way, i.e., 18273162682944 + 3151505461504 = 4274712^2 + 1775248^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21424668144392 and 21424668144401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167380219815 + ... + 167380219942.

Almost surely, 2^{21424668144448} is an apocalyptic number.

It is an amenable number.

21424668144448 is a deficient number, since it is larger than the sum of its proper divisors (21089907704818).

21424668144448 is an equidigital number, since it uses as much as digits as its factorization.

21424668144448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334760439769 (or 334760439759 counting only the distinct ones).

The product of its digits is 37748736, while the sum is 58.

The spelling of 21424668144448 in words is "twenty-one trillion, four hundred twenty-four billion, six hundred sixty-eight million, one hundred forty-four thousand, four hundred forty-eight".