1002222221 has 24 divisors (see below), whose sum is σ = 1353052224. Its totient is φ = 720869760.

The previous prime is 1002222121. The next prime is 1002222229. The reversal of 1002222221 is 1222222001.

It is not a de Polignac number, because 1002222221 - 2¹⁴ = 1002205837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1002222196 and 1002222205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002222229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25496 + ... + 51521.

It is an arithmetic number, because the mean of its divisors is an integer number (56377176).

Almost surely, 2^1002222221 is an apocalyptic number.

1002222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1002222221 is a deficient number, since it is larger than the sum of its proper divisors (350830003).

1002222221 is a wasteful number, since it uses less digits than its factorization.

1002222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77061 (or 77048 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1002222221 is about 31657.8935022531. The cubic root of 1002222221 is about 1000.7401923135.

Adding to 1002222221 its reverse (1222222001), we get a palindrome (2224444222).

The spelling of 1002222221 in words is "one billion, two million, two hundred twenty-two thousand, two hundred twenty-one".