21115334634441 has 16 divisors (see below), whose sum is σ = 28190073081600. Its totient is φ = 14058744818048.

The previous prime is 21115334634403. The next prime is 21115334634473. The reversal of 21115334634441 is 14443643351112.

It is a cyclic number.

It is not a de Polignac number, because 21115334634441 - 2⁶ = 21115334634377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21115334634393 and 21115334634402.

It is not an unprimeable number, because it can be changed into a prime (21115334634491) 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 15 ways as a sum of consecutive naturals, for example, 47656915 + ... + 48097943.

It is an arithmetic number, because the mean of its divisors is an integer number (1761879567600).

Almost surely, 2^{21115334634441} is an apocalyptic number.

It is an amenable number.

21115334634441 is a deficient number, since it is larger than the sum of its proper divisors (7074738447159).

21115334634441 is a wasteful number, since it uses less digits than its factorization.

21115334634441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461568.

The product of its digits is 414720, while the sum is 42.

Adding to 21115334634441 its reverse (14443643351112), we get a palindrome (35558977985553).

The spelling of 21115334634441 in words is "twenty-one trillion, one hundred fifteen billion, three hundred thirty-four million, six hundred thirty-four thousand, four hundred forty-one".