21908880000 has 1440 divisors, whose sum is σ = 99169630560. Its totient is φ = 4790016000.

The previous prime is 21908879969. The next prime is 21908880013. The reversal of 21908880000 is 8880912.

It is a tau number, because it is divible by the number of its divisors (1440).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 952559989 + ... + 952560011.

It is an arithmetic number, because the mean of its divisors is an integer number (68867799).

Almost surely, 2^21908880000 is an apocalyptic number.

21908880000 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 21908880000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49584815280).

21908880000 is an abundant number, since it is smaller than the sum of its proper divisors (77260750560).

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

21908880000 is an frugal number, since it uses more digits than its factorization.

21908880000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 21908880000 in words is "twenty-one billion, nine hundred eight million, eight hundred eighty thousand".