21438904241675 has 12 divisors (see below), whose sum is σ = 26737907399520. Its totient is φ = 17051983948320.

The previous prime is 21438904241597. The next prime is 21438904241687. The reversal of 21438904241675 is 57614240983412.

It is not a de Polignac number, because 21438904241675 - 2¹⁸ = 21438903979531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21438904241675.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2478481715 + ... + 2478490364.

It is an arithmetic number, because the mean of its divisors is an integer number (2228158949960).

It is a 1-persistent number, because it is pandigital, but 2⋅21438904241675 = 42877808483350 is not.

Almost surely, 2^{21438904241675} is an apocalyptic number.

21438904241675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21438904241675 is a deficient number, since it is larger than the sum of its proper divisors (5299003157845).

21438904241675 is a wasteful number, since it uses less digits than its factorization.

21438904241675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4956972262 (or 4956972257 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 56.

The spelling of 21438904241675 in words is "twenty-one trillion, four hundred thirty-eight billion, nine hundred four million, two hundred forty-one thousand, six hundred seventy-five".