21113343516545 has 32 divisors (see below), whose sum is σ = 29177369945856. Its totient is φ = 14366764339200.

The previous prime is 21113343516539. The next prime is 21113343516649. The reversal of 21113343516545 is 54561534331112.

It is not a de Polignac number, because 21113343516545 - 2⁸ = 21113343516289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113343516496 and 21113343516505.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 235445357 + ... + 235535013.

It is an arithmetic number, because the mean of its divisors is an integer number (911792810808).

Almost surely, 2^{21113343516545} is an apocalyptic number.

It is an amenable number.

21113343516545 is a deficient number, since it is larger than the sum of its proper divisors (8064026429311).

21113343516545 is a wasteful number, since it uses less digits than its factorization.

21113343516545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141161.

The product of its digits is 648000, while the sum is 44.

Adding to 21113343516545 its reverse (54561534331112), we get a palindrome (75674877847657).

The spelling of 21113343516545 in words is "twenty-one trillion, one hundred thirteen billion, three hundred forty-three million, five hundred sixteen thousand, five hundred forty-five".