22121220220 has 48 divisors (see below), whose sum is σ = 51755977728. Its totient is φ = 7872925760.

The previous prime is 22121220203. The next prime is 22121220223. The reversal of 22121220220 is 2202212122.

It is a junction number, because it is equal to n+sod(n) for n = 22121220194 and 22121220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121220223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1059352 + ... + 1080031.

It is an arithmetic number, because the mean of its divisors is an integer number (1078249536).

Almost surely, 2^22121220220 is an apocalyptic number.

22121220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121220220 is an abundant number, since it is smaller than the sum of its proper divisors (29634757508).

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

22121220220 is a wasteful number, since it uses less digits than its factorization.

22121220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139450 (or 2139448 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22121220220 its reverse (2202212122), we get a palindrome (24323432342).

The spelling of 22121220220 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty thousand, two hundred twenty".