21980217822 has 32 divisors (see below), whose sum is σ = 44046374400. Its totient is φ = 7312434720.

The previous prime is 21980217821. The next prime is 21980217829. The reversal of 21980217822 is 22871208912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21980217821) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12682468 + ... + 12684200.

It is an arithmetic number, because the mean of its divisors is an integer number (1376449200).

Almost surely, 2^21980217822 is an apocalyptic number.

21980217822 is an abundant number, since it is smaller than the sum of its proper divisors (22066156578).

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

21980217822 is a wasteful number, since it uses less digits than its factorization.

21980217822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4648.

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 21980217822 in words is "twenty-one billion, nine hundred eighty million, two hundred seventeen thousand, eight hundred twenty-two".