21113343516544 has 32 divisors (see below), whose sum is σ = 42062105496600. Its totient is φ = 10556579784192.

The previous prime is 21113343516539. The next prime is 21113343516649. The reversal of 21113343516544 is 44561534331112.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21113343516544.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 15445339 + ... + 16756645.

Almost surely, 2^{21113343516544} is an apocalyptic number.

It is an amenable number.

21113343516544 is a deficient number, since it is larger than the sum of its proper divisors (20948761980056).

21113343516544 is a wasteful number, since it uses less digits than its factorization.

21113343516544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437110 (or 1437098 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

Adding to 21113343516544 its reverse (44561534331112), we get a palindrome (65674877847656).

The spelling of 21113343516544 in words is "twenty-one trillion, one hundred thirteen billion, three hundred forty-three million, five hundred sixteen thousand, five hundred forty-four".