21109803120 has 320 divisors, whose sum is σ = 83351808000. Its totient is φ = 4810420224.

The previous prime is 21109803101. The next prime is 21109803133. The reversal of 21109803120 is 2130890112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5426136 + ... + 5430024.

It is an arithmetic number, because the mean of its divisors is an integer number (260474400).

Almost surely, 2^21109803120 is an apocalyptic number.

21109803120 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 21109803120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41675904000).

21109803120 is an abundant number, since it is smaller than the sum of its proper divisors (62242004880).

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

21109803120 is a wasteful number, since it uses less digits than its factorization.

21109803120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4277 (or 4265 counting only the distinct ones).

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

The spelling of 21109803120 in words is "twenty-one billion, one hundred nine million, eight hundred three thousand, one hundred twenty".