1000222120 has 16 divisors (see below), whose sum is σ = 2250499860. Its totient is φ = 400088832.

The previous prime is 1000222117. The next prime is 1000222121. The reversal of 1000222120 is 212220001.

It can be written as a sum of positive squares in 2 ways, for example, as 966836836 + 33385284 = 31094^2 + 5778^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1000222097 and 1000222106.

It is not an unprimeable number, because it can be changed into a prime (1000222121) 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 3 ways as a sum of consecutive naturals, for example, 12502737 + ... + 12502816.

Almost surely, 2^1000222120 is an apocalyptic number.

1000222120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000222120 is an abundant number, since it is smaller than the sum of its proper divisors (1250277740).

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

1000222120 is a wasteful number, since it uses less digits than its factorization.

1000222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25005564 (or 25005560 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1000222120 is about 31626.2884322521. The cubic root of 1000222120 is about 1000.0740345188.

Adding to 1000222120 its reverse (212220001), we get a palindrome (1212442121).

The spelling of 1000222120 in words is "one billion, two hundred twenty-two thousand, one hundred twenty".