1021222208 has 56 divisors (see below), whose sum is σ = 2061057600. Its totient is φ = 501977088.

The previous prime is 1021222207. The next prime is 1021222229. The reversal of 1021222208 is 8022221201.

It is a happy number.

It is a super-2 number, since 2×1021222208² = 2085789596224790528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1021222208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110773 + ... + 1111691.

It is an arithmetic number, because the mean of its divisors is an integer number (36804600).

Almost surely, 2^1021222208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021222208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030528800).

1021222208 is an abundant number, since it is smaller than the sum of its proper divisors (1039835392).

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

1021222208 is an equidigital number, since it uses as much as digits as its factorization.

1021222208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207 (or 1197 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 1021222208 is about 31956.5675253147. The cubic root of 1021222208 is about 1007.0246086631.

Adding to 1021222208 its reverse (8022221201), we get a palindrome (9043443409).

The spelling of 1021222208 in words is "one billion, twenty-one million, two hundred twenty-two thousand, two hundred eight".