21222120011020 has 24 divisors (see below), whose sum is σ = 44576371297584. Its totient is φ = 8486958618816.

The previous prime is 21222120011003. The next prime is 21222120011023. The reversal of 21222120011020 is 2011002122212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21222120010985 and 21222120011003.

It is not an unprimeable number, because it can be changed into a prime (21222120011023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117994494 + ... + 118174213.

It is an arithmetic number, because the mean of its divisors is an integer number (1857348804066).

Almost surely, 2^{21222120011020} is an apocalyptic number.

21222120011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222120011020 is an abundant number, since it is smaller than the sum of its proper divisors (23354251286564).

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

21222120011020 is a wasteful number, since it uses less digits than its factorization.

21222120011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236173209 (or 236173207 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21222120011020 its reverse (2011002122212), we get a palindrome (23233122133232).

The spelling of 21222120011020 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, eleven thousand, twenty".