21544144430354 has 48 divisors (see below), whose sum is σ = 40486469751000. Its totient is φ = 8522449157376.

The previous prime is 21544144430311. The next prime is 21544144430383. The reversal of 21544144430354 is 45303444144512.

It can be written as a sum of positive squares in 4 ways, for example, as 12060374568025 + 9483769862329 = 3472805^2 + 3079573^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21198422 + ... + 22191470.

Almost surely, 2^{21544144430354} is an apocalyptic number.

21544144430354 is a deficient number, since it is larger than the sum of its proper divisors (18942325320646).

21544144430354 is a wasteful number, since it uses less digits than its factorization.

21544144430354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010107 (or 1010100 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 44.

Adding to 21544144430354 its reverse (45303444144512), we get a palindrome (66847588574866).

The spelling of 21544144430354 in words is "twenty-one trillion, five hundred forty-four billion, one hundred forty-four million, four hundred thirty thousand, three hundred fifty-four".