21039615744191 has 16 divisors (see below), whose sum is σ = 23794610336640. Its totient is φ = 18427829491680.

The previous prime is 21039615744167. The next prime is 21039615744193. The reversal of 21039615744191 is 19144751693012.

It is a cyclic number.

It is not a de Polignac number, because 21039615744191 - 2⁶ = 21039615744127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21039615744193) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 70466561 + ... + 70764506.

It is an arithmetic number, because the mean of its divisors is an integer number (1487163146040).

Almost surely, 2^{21039615744191} is an apocalyptic number.

21039615744191 is a deficient number, since it is larger than the sum of its proper divisors (2754994592449).

21039615744191 is a wasteful number, since it uses less digits than its factorization.

21039615744191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141231574.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 21039615744191 in words is "twenty-one trillion, thirty-nine billion, six hundred fifteen million, seven hundred forty-four thousand, one hundred ninety-one".