21999058998 has 128 divisors (see below), whose sum is σ = 55660234752. Its totient is φ = 5647927296.

The previous prime is 21999058987. The next prime is 21999059011. The reversal of 21999058998 is 89985099912.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (69).

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 63 ways as a sum of consecutive naturals, for example, 12693340 + ... + 12695072.

It is an arithmetic number, because the mean of its divisors is an integer number (434845584).

Almost surely, 2^21999058998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21999058998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27830117376).

21999058998 is an abundant number, since it is smaller than the sum of its proper divisors (33661175754).

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

21999058998 is a wasteful number, since it uses less digits than its factorization.

21999058998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558.

The product of its (nonzero) digits is 37791360, while the sum is 69.

The spelling of 21999058998 in words is "twenty-one billion, nine hundred ninety-nine million, fifty-eight thousand, nine hundred ninety-eight".