Adding to 1222221000 its reverse (1222221), we get a palindrome (1223443221).
1222221000 divided by its reverse (1222221) gives a cube (1000 = 103).
It is a congruent number.
It is an unprimeable number.
Almost surely, 21222221000 is an apocalyptic number.
1222221000 is a gapful number since it is divisible by the number (10) 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 1222221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2649104640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1222221000 is a wasteful number, since it uses less digits than its factorization.
1222221000 is an evil number, because the sum of its binary digits is even.
The square root of 1222221000 is about 34960.2774588532. The cubic root of 1222221000 is about 1069.1777536058.
The spelling of 1222221000 in words is "one billion, two hundred twenty-two million, two hundred twenty-one thousand".