21115334515363 has 4 divisors (see below), whose sum is σ = 23034910380408. Its totient is φ = 19195758650320.

The previous prime is 21115334515349. The next prime is 21115334515427. The reversal of 21115334515363 is 36351543351112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21115334515363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21115334515343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959787932506 + ... + 959787932527.

It is an arithmetic number, because the mean of its divisors is an integer number (5758727595102).

Almost surely, 2^{21115334515363} is an apocalyptic number.

21115334515363 is a deficient number, since it is larger than the sum of its proper divisors (1919575865045).

21115334515363 is a wasteful number, since it uses less digits than its factorization.

21115334515363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919575865044.

The product of its digits is 486000, while the sum is 43.

Adding to 21115334515363 its reverse (36351543351112), we get a palindrome (57466877866475).

The spelling of 21115334515363 in words is "twenty-one trillion, one hundred fifteen billion, three hundred thirty-four million, five hundred fifteen thousand, three hundred sixty-three".