21960789720 has 256 divisors, whose sum is σ = 72306432000. Its totient is φ = 5313724416.

The previous prime is 21960789707. The next prime is 21960789743. The reversal of 21960789720 is 2798706912.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6928296 + ... + 6931464.

It is an arithmetic number, because the mean of its divisors is an integer number (282447000).

Almost surely, 2^21960789720 is an apocalyptic number.

21960789720 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 21960789720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36153216000).

21960789720 is an abundant number, since it is smaller than the sum of its proper divisors (50345642280).

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

21960789720 is a wasteful number, since it uses less digits than its factorization.

21960789720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322 (or 3318 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 21960789720 in words is "twenty-one billion, nine hundred sixty million, seven hundred eighty-nine thousand, seven hundred twenty".