21113343516523 has 8 divisors (see below), whose sum is σ = 21153711007296. Its totient is φ = 21073002720000.

The previous prime is 21113343516521. The next prime is 21113343516533. The reversal of 21113343516523 is 32561534331112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21113343516523 - 2¹ = 21113343516521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113343516521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5089828 + ... + 8254273.

It is an arithmetic number, because the mean of its divisors is an integer number (2644213875912).

Almost surely, 2^{21113343516523} is an apocalyptic number.

21113343516523 is a deficient number, since it is larger than the sum of its proper divisors (40367490773).

21113343516523 is a wasteful number, since it uses less digits than its factorization.

21113343516523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13347125.

The product of its digits is 194400, while the sum is 40.

Adding to 21113343516523 its reverse (32561534331112), we get a palindrome (53674877847635).

The spelling of 21113343516523 in words is "twenty-one trillion, one hundred thirteen billion, three hundred forty-three million, five hundred sixteen thousand, five hundred twenty-three".