21999798000 has 240 divisors, whose sum is σ = 76985135136. Its totient is φ = 5855385600.

The previous prime is 21999797983. The next prime is 21999798017. The reversal of 21999798000 is 89799912.

It is an interprime number because it is at equal distance from previous prime (21999797983) and next prime (21999798017).

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×21999798000² (a number of 21 digits) contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 14165224 + ... + 14166776.

Almost surely, 2^21999798000 is an apocalyptic number.

21999798000 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 21999798000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38492567568).

21999798000 is an abundant number, since it is smaller than the sum of its proper divisors (54985337136).

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

21999798000 is a wasteful number, since it uses less digits than its factorization.

21999798000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369 (or 2350 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 21999798000 in words is "twenty-one billion, nine hundred ninety-nine million, seven hundred ninety-eight thousand".