21167411320 has 128 divisors (see below), whose sum is σ = 56455833600. Its totient is φ = 7056806400.

The previous prime is 21167411303. The next prime is 21167411327. The reversal of 21167411320 is 2311476112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167411327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218322 + ... + 299998.

It is an arithmetic number, because the mean of its divisors is an integer number (441061200).

Almost surely, 2^21167411320 is an apocalyptic number.

21167411320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21167411320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28227916800).

21167411320 is an abundant number, since it is smaller than the sum of its proper divisors (35288422280).

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

21167411320 is a wasteful number, since it uses less digits than its factorization.

21167411320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81749 (or 81745 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 21167411320 its reverse (2311476112), we get a palindrome (23478887432).

The spelling of 21167411320 in words is "twenty-one billion, one hundred sixty-seven million, four hundred eleven thousand, three hundred twenty".