21758222976 has 192 divisors, whose sum is σ = 66950009280. Its totient is φ = 6133211136.

The previous prime is 21758222971. The next prime is 21758223001. The reversal of 21758222976 is 67922285712.

It is a tau number, because it is divible by the number of its divisors (192).

It is not an unprimeable number, because it can be changed into a prime (21758222971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16775160 + ... + 16776456.

It is an arithmetic number, because the mean of its divisors is an integer number (348697965).

Almost surely, 2^21758222976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21758222976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33475004640).

21758222976 is an abundant number, since it is smaller than the sum of its proper divisors (45191786304).

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

21758222976 is an equidigital number, since it uses as much as digits as its factorization.

21758222976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479 (or 1388 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 51.

The spelling of 21758222976 in words is "twenty-one billion, seven hundred fifty-eight million, two hundred twenty-two thousand, nine hundred seventy-six".