21023515115523 has 48 divisors (see below), whose sum is σ = 31605484135680. Its totient is φ = 13450100061888.

The previous prime is 21023515115521. The next prime is 21023515115539. The reversal of 21023515115523 is 32551151532012.

21023515115523 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 3 + 5 + 15 + 115 + 523 = 666.

It is not a de Polignac number, because 21023515115523 - 2¹ = 21023515115521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21023515115521) 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 47 ways as a sum of consecutive naturals, for example, 797934036 + ... + 797960382.

It is an arithmetic number, because the mean of its divisors is an integer number (658447586160).

Almost surely, 2^{21023515115523} is an apocalyptic number.

21023515115523 is a deficient number, since it is larger than the sum of its proper divisors (10581969020157).

21023515115523 is a wasteful number, since it uses less digits than its factorization.

21023515115523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44856 (or 44853 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

Adding to 21023515115523 its reverse (32551151532012), we get a palindrome (53574666647535).

The spelling of 21023515115523 in words is "twenty-one trillion, twenty-three billion, five hundred fifteen million, one hundred fifteen thousand, five hundred twenty-three".