21102132320 has 96 divisors (see below), whose sum is σ = 50879767680. Its totient is φ = 8267683840.

The previous prime is 21102132319. The next prime is 21102132341. The reversal of 21102132320 is 2323120112.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6095390 + ... + 6098850.

It is an arithmetic number, because the mean of its divisors is an integer number (529997580).

Almost surely, 2^21102132320 is an apocalyptic number.

21102132320 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 21102132320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25439883840).

21102132320 is an abundant number, since it is smaller than the sum of its proper divisors (29777635360).

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

21102132320 is a wasteful number, since it uses less digits than its factorization.

21102132320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248 (or 4240 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21102132320 its reverse (2323120112), we get a palindrome (23425252432).

The spelling of 21102132320 in words is "twenty-one billion, one hundred two million, one hundred thirty-two thousand, three hundred twenty".