21201112022220 has 144 divisors (see below), whose sum is σ = 69942679252992. Its totient is φ = 5167064563200.

The previous prime is 21201112022213. The next prime is 21201112022239. The reversal of 21201112022220 is 2222021110212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21201112022193 and 21201112022202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44616652 + ... + 45089331.

It is an arithmetic number, because the mean of its divisors is an integer number (485713050368).

Almost surely, 2^{21201112022220} is an apocalyptic number.

21201112022220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201112022220 is an abundant number, since it is smaller than the sum of its proper divisors (48741567230772).

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

21201112022220 is a wasteful number, since it uses less digits than its factorization.

21201112022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89706112 (or 89706107 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21201112022220 its reverse (2222021110212), we get a palindrome (23423133132432).

The spelling of 21201112022220 in words is "twenty-one trillion, two hundred one billion, one hundred twelve million, twenty-two thousand, two hundred twenty".