21160523523 has 16 divisors (see below), whose sum is σ = 29151747072. Its totient is φ = 13639020000.

The previous prime is 21160523507. The next prime is 21160523537. The reversal of 21160523523 is 32532506112.

It is not a de Polignac number, because 21160523523 - 2⁴ = 21160523507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21160523323) 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 15 ways as a sum of consecutive naturals, for example, 8553 + ... + 205898.

It is an arithmetic number, because the mean of its divisors is an integer number (1821984192).

Almost surely, 2^21160523523 is an apocalyptic number.

21160523523 is a deficient number, since it is larger than the sum of its proper divisors (7991223549).

21160523523 is a wasteful number, since it uses less digits than its factorization.

21160523523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215546.

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 21160523523 in words is "twenty-one billion, one hundred sixty million, five hundred twenty-three thousand, five hundred twenty-three".