21373002523 has 16 divisors (see below), whose sum is σ = 22196021760. Its totient is φ = 20555892000.

The previous prime is 21373002503. The next prime is 21373002527. The reversal of 21373002523 is 32520037312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21373002523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21373002491 and 21373002500.

It is not an unprimeable number, because it can be changed into a prime (21373002527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13135636 + ... + 13137262.

It is an arithmetic number, because the mean of its divisors is an integer number (1387251360).

Almost surely, 2^21373002523 is an apocalyptic number.

21373002523 is a deficient number, since it is larger than the sum of its proper divisors (823019237).

21373002523 is a wasteful number, since it uses less digits than its factorization.

21373002523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138.

The product of its (nonzero) digits is 7560, while the sum is 28.

Adding to 21373002523 its reverse (32520037312), we get a palindrome (53893039835).

The spelling of 21373002523 in words is "twenty-one billion, three hundred seventy-three million, two thousand, five hundred twenty-three".