22211221220 has 48 divisors (see below), whose sum is σ = 48454156800. Its totient is φ = 8542181760.

The previous prime is 22211221211. The next prime is 22211221229. The reversal of 22211221220 is 2212211222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22211221211) and next prime (22211221229).

It is not an unprimeable number, because it can be changed into a prime (22211221229) 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, 58505 + ... + 218735.

It is an arithmetic number, because the mean of its divisors is an integer number (1009461600).

Almost surely, 2^22211221220 is an apocalyptic number.

22211221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22211221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24227078400).

22211221220 is an abundant number, since it is smaller than the sum of its proper divisors (26242935580).

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

22211221220 is a wasteful number, since it uses less digits than its factorization.

22211221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160508 (or 160506 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22211221220 its reverse (2212211222), we get a palindrome (24423432442).

The spelling of 22211221220 in words is "twenty-two billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty".