21835168520 has 32 divisors (see below), whose sum is σ = 53595414720. Its totient is φ = 7940061120.

The previous prime is 21835168513. The next prime is 21835168573. The reversal of 21835168520 is 2586153812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24812252 + ... + 24813131.

It is an arithmetic number, because the mean of its divisors is an integer number (1674856710).

Almost surely, 2^21835168520 is an apocalyptic number.

21835168520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21835168520 is an abundant number, since it is smaller than the sum of its proper divisors (31760246200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21835168520 is a wasteful number, since it uses less digits than its factorization.

21835168520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49625405 (or 49625401 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 21835168520 in words is "twenty-one billion, eight hundred thirty-five million, one hundred sixty-eight thousand, five hundred twenty".