21322212122220 has 192 divisors, whose sum is σ = 61378021555200. Its totient is φ = 5528818713600.

The previous prime is 21322212122219. The next prime is 21322212122243. The reversal of 21322212122220 is 2222121222312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 114974089 + ... + 115159391.

It is an arithmetic number, because the mean of its divisors is an integer number (319677195600).

Almost surely, 2^{21322212122220} is an apocalyptic number.

21322212122220 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 21322212122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30689010777600).

21322212122220 is an abundant number, since it is smaller than the sum of its proper divisors (40055809432980).

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

21322212122220 is a wasteful number, since it uses less digits than its factorization.

21322212122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185736 (or 185734 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21322212122220 its reverse (2222121222312), we get a palindrome (23544333344532).

The spelling of 21322212122220 in words is "twenty-one trillion, three hundred twenty-two billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty".