22221221022 has 192 divisors, whose sum is σ = 67039225344. Its totient is φ = 5327648640.

The previous prime is 22221221021. The next prime is 22221221023. The reversal of 22221221022 is 22012212222.

22221221022 is a `hidden beast` number, since 222 + 212 + 210 + 22 = 666.

It is an interprime number because it is at equal distance from previous prime (22221221021) and next prime (22221221023).

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 = 22221220986 and 22221221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221221021) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 463648 + ... + 509324.

It is an arithmetic number, because the mean of its divisors is an integer number (349162632).

Almost surely, 2^22221221022 is an apocalyptic number.

22221221022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 22221221022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33519612672).

22221221022 is an abundant number, since it is smaller than the sum of its proper divisors (44818004322).

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

22221221022 is a wasteful number, since it uses less digits than its factorization.

22221221022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45725 (or 45713 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22221221022 its reverse (22012212222), we get a palindrome (44233433244).

The spelling of 22221221022 in words is "twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, twenty-two".