21040001523 has 24 divisors (see below), whose sum is σ = 31106549760. Its totient is φ = 13696648560.

The previous prime is 21040001509. The next prime is 21040001561. The reversal of 21040001523 is 32510004012.

21040001523 is a `hidden beast` number, since 210 + 400 + 0 + 1 + 52 + 3 = 666.

It is not a de Polignac number, because 21040001523 - 2⁸ = 21040001267 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21040001496 and 21040001505.

It is not an unprimeable number, because it can be changed into a prime (21040001503) 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 23 ways as a sum of consecutive naturals, for example, 2255038 + ... + 2264348.

It is an arithmetic number, because the mean of its divisors is an integer number (1296106240).

Almost surely, 2^21040001523 is an apocalyptic number.

21040001523 is a deficient number, since it is larger than the sum of its proper divisors (10066548237).

21040001523 is a wasteful number, since it uses less digits than its factorization.

21040001523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15199 (or 15196 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 21040001523 its reverse (32510004012), we get a palindrome (53550005535).

The spelling of 21040001523 in words is "twenty-one billion, forty million, one thousand, five hundred twenty-three".