1000222221 has 16 divisors (see below), whose sum is σ = 1392897600. Its totient is φ = 637792128.

The previous prime is 1000222219. The next prime is 1000222243. The reversal of 1000222221 is 1222220001.

It is not a de Polignac number, because 1000222221 - 2¹ = 1000222219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1000222197 and 1000222206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000222211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69816 + ... + 82913.

It is an arithmetic number, because the mean of its divisors is an integer number (87056100).

Almost surely, 2^1000222221 is an apocalyptic number.

It is an amenable number.

1000222221 is a deficient number, since it is larger than the sum of its proper divisors (392675379).

1000222221 is a wasteful number, since it uses less digits than its factorization.

1000222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152828.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1000222221 is about 31626.2900290249. The cubic root of 1000222221 is about 1000.0740681804.

Adding to 1000222221 its reverse (1222220001), we get a palindrome (2222442222).

It can be divided in two parts, 10002 and 22221, that added together give a palindrome (32223).

The spelling of 1000222221 in words is "one billion, two hundred twenty-two thousand, two hundred twenty-one".