22111221220 has 48 divisors (see below), whose sum is σ = 50835206016. Its totient is φ = 8011808000.

The previous prime is 22111221217. The next prime is 22111221259. The reversal of 22111221220 is 2212211122.

It is a happy number.

It is a super-2 number, since 2×22111221220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22111221194 and 22111221203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117016 + ... + 240655.

It is an arithmetic number, because the mean of its divisors is an integer number (1059066792).

Almost surely, 2^22111221220 is an apocalyptic number.

22111221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22111221220 is an abundant number, since it is smaller than the sum of its proper divisors (28723984796).

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

22111221220 is a wasteful number, since it uses less digits than its factorization.

22111221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357972 (or 357970 counting only the distinct ones).

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

Adding to 22111221220 its reverse (2212211122), we get a palindrome (24323432342).

The spelling of 22111221220 in words is "twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty".