220921221822 has 64 divisors (see below), whose sum is σ = 527926394880. Its totient is φ = 60260406624.

The previous prime is 220921221757. The next prime is 220921221827. The reversal of 220921221822 is 228122129022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220921221827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 286579 + ... + 723857.

It is an arithmetic number, because the mean of its divisors is an integer number (8248849920).

Almost surely, 2^220921221822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220921221822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263963197440).

220921221822 is an abundant number, since it is smaller than the sum of its proper divisors (307005173058).

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

220921221822 is a wasteful number, since it uses less digits than its factorization.

220921221822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437837.

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 220921221822 in words is "two hundred twenty billion, nine hundred twenty-one million, two hundred twenty-one thousand, eight hundred twenty-two".