21113138160 has 80 divisors (see below), whose sum is σ = 72723038880. Its totient is φ = 5630169600.

The previous prime is 21113138131. The next prime is 21113138161. The reversal of 21113138160 is 6183131112.

21113138160 is a `hidden beast` number, since 211 + 1 + 313 + 81 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113138161) 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, 4885141 + ... + 4889460.

It is an arithmetic number, because the mean of its divisors is an integer number (909037986).

Almost surely, 2^21113138160 is an apocalyptic number.

21113138160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113138160 is an abundant number, since it is smaller than the sum of its proper divisors (51609900720).

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

21113138160 is a wasteful number, since it uses less digits than its factorization.

21113138160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9774623 (or 9774611 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

Adding to 21113138160 its reverse (6183131112), we get a palindrome (27296269272).

The spelling of 21113138160 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-eight thousand, one hundred sixty".