22021221222 has 192 divisors, whose sum is σ = 66878784000. Its totient is φ = 5279722560.

The previous prime is 22021221221. The next prime is 22021221241. The reversal of 22021221222 is 22212212022.

22021221222 is a `hidden beast` number, since 220 + 2 + 1 + 221 + 222 = 666.

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 = 22021221195 and 22021221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021221221) 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, 349279 + ... + 407477.

It is an arithmetic number, because the mean of its divisors is an integer number (348327000).

Almost surely, 2^22021221222 is an apocalyptic number.

22021221222 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 22021221222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33439392000).

22021221222 is an abundant number, since it is smaller than the sum of its proper divisors (44857562778).

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

22021221222 is a wasteful number, since it uses less digits than its factorization.

22021221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58248 (or 58235 counting only the distinct ones).

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

Adding to 22021221222 its reverse (22212212022), we get a palindrome (44233433244).

The spelling of 22021221222 in words is "twenty-two billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".