21995719903980 has 288 divisors, whose sum is σ = 71109906067200. Its totient is φ = 5704087350528.

The previous prime is 21995719903919. The next prime is 21995719903981. The reversal of 21995719903980 is 8930991759912.

21995719903980 is a `hidden beast` number, since 2 + 1 + 99 + 57 + 19 + 90 + 398 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21995719903899 and 21995719903908.

It is not an unprimeable number, because it can be changed into a prime (21995719903981) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 47626611 + ... + 48086229.

Almost surely, 2^{21995719903980} is an apocalyptic number.

21995719903980 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 21995719903980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35554953033600).

21995719903980 is an abundant number, since it is smaller than the sum of its proper divisors (49114186163220).

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

21995719903980 is a wasteful number, since it uses less digits than its factorization.

21995719903980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459915 (or 459901 counting only the distinct ones).

The product of its (nonzero) digits is 99202320, while the sum is 72.

The spelling of 21995719903980 in words is "twenty-one trillion, nine hundred ninety-five billion, seven hundred nineteen million, nine hundred three thousand, nine hundred eighty".