21930020320 has 96 divisors (see below), whose sum is σ = 56107689120. Its totient is φ = 8051865600.

The previous prime is 21930020311. The next prime is 21930020369. The reversal of 21930020320 is 2302003912.

It is a super-2 number, since 2×21930020320² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21930020291 and 21930020300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342870 + ... + 401770.

It is an arithmetic number, because the mean of its divisors is an integer number (584455095).

Almost surely, 2^21930020320 is an apocalyptic number.

21930020320 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 21930020320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28053844560).

21930020320 is an abundant number, since it is smaller than the sum of its proper divisors (34177668800).

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

21930020320 is a wasteful number, since it uses less digits than its factorization.

21930020320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59108 (or 59100 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The spelling of 21930020320 in words is "twenty-one billion, nine hundred thirty million, twenty thousand, three hundred twenty".