21999098880 has 1408 divisors, whose sum is σ = 96778229760. Its totient is φ = 4671406080.

The previous prime is 21999098879. The next prime is 21999098939. The reversal of 21999098880 is 8889099912.

It is a tau number, because it is divible by the number of its divisors (1408).

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 127 ways as a sum of consecutive naturals, for example, 594570222 + ... + 594570258.

Almost surely, 2^21999098880 is an apocalyptic number.

21999098880 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 21999098880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48389114880).

21999098880 is an abundant number, since it is smaller than the sum of its proper divisors (74779130880).

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

21999098880 is a wasteful number, since it uses less digits than its factorization.

21999098880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 63.

It can be divided in two parts, 219 and 99098880, that added together give a palindrome (99099099).

The spelling of 21999098880 in words is "twenty-one billion, nine hundred ninety-nine million, ninety-eight thousand, eight hundred eighty".