21999065088 has 768 divisors, whose sum is σ = 81454464000. Its totient is φ = 5202247680.

The previous prime is 21999065017. The next prime is 21999065107. The reversal of 21999065088 is 88056099912.

It is a tau number, because it is divible by the number of its divisors (768).

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, 301357020 + ... + 301357092.

It is an arithmetic number, because the mean of its divisors is an integer number (106060500).

Almost surely, 2^21999065088 is an apocalyptic number.

21999065088 is a gapful number since it is divisible by the number (28) 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 21999065088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40727232000).

21999065088 is an abundant number, since it is smaller than the sum of its proper divisors (59455398912).

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

21999065088 is a wasteful number, since it uses less digits than its factorization.

21999065088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 57.

The spelling of 21999065088 in words is "twenty-one billion, nine hundred ninety-nine million, sixty-five thousand, eighty-eight".