221212221122020 has 24 divisors (see below), whose sum is σ = 464545954051200. Its totient is φ = 88484833268832.

The previous prime is 221212221121967. The next prime is 221212221122083. The reversal of 221212221122020 is 20221122212122.

It is a junction number, because it is equal to n+sod(n) for n = 221212221121982 and 221212221122000.

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, 48537591 + ... + 52899169.

It is an arithmetic number, because the mean of its divisors is an integer number (19356081418800).

Almost surely, 2^{221212221122020} is an apocalyptic number.

221212221122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212221122020 is an abundant number, since it is smaller than the sum of its proper divisors (243333732929180).

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

221212221122020 is a wasteful number, since it uses less digits than its factorization.

221212221122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6897507 (or 6897505 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221212221122020 its reverse (20221122212122), we get a palindrome (241433343334142).

The spelling of 221212221122020 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty-two thousand, twenty".