21222002122220 has 24 divisors (see below), whose sum is σ = 46003823956608. Its totient is φ = 8214968563200.

The previous prime is 21222002122213. The next prime is 21222002122249. The reversal of 21222002122220 is 2222120022212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21222002122192 and 21222002122201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17114517221 + ... + 17114518460.

It is an arithmetic number, because the mean of its divisors is an integer number (1916825998192).

Almost surely, 2^{21222002122220} is an apocalyptic number.

21222002122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222002122220 is an abundant number, since it is smaller than the sum of its proper divisors (24781821834388).

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

21222002122220 is a wasteful number, since it uses less digits than its factorization.

21222002122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34229035721 (or 34229035719 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21222002122220 its reverse (2222120022212), we get a palindrome (23444122144432).

The spelling of 21222002122220 in words is "twenty-one trillion, two hundred twenty-two billion, two million, one hundred twenty-two thousand, two hundred twenty".