21424203253305 has 12 divisors (see below), whose sum is σ = 37135285639140. Its totient is φ = 11426241735072.

The previous prime is 21424203253279. The next prime is 21424203253337. The reversal of 21424203253305 is 50335230242412.

21424203253305 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 4 + 20 + 325 + 3 + 305 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10109671744041 + 11314531509264 = 3179571^2 + 3363708^2 .

It is not a de Polignac number, because 21424203253305 - 2²⁴ = 21424186476089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21424203253305.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238046702770 + ... + 238046702859.

It is an arithmetic number, because the mean of its divisors is an integer number (3094607136595).

Almost surely, 2^{21424203253305} is an apocalyptic number.

It is an amenable number.

21424203253305 is a deficient number, since it is larger than the sum of its proper divisors (15711082385835).

21424203253305 is a wasteful number, since it uses less digits than its factorization.

21424203253305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476093405640 (or 476093405637 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Adding to 21424203253305 its reverse (50335230242412), we get a palindrome (71759433495717).

The spelling of 21424203253305 in words is "twenty-one trillion, four hundred twenty-four billion, two hundred three million, two hundred fifty-three thousand, three hundred five".