1000221216 has 24 divisors (see below), whose sum is σ = 2625580944. Its totient is φ = 333407040.

The previous prime is 1000221203. The next prime is 1000221221. The reversal of 1000221216 is 6121220001.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 1000221195 and 1000221204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5209390 + ... + 5209581.

It is an arithmetic number, because the mean of its divisors is an integer number (109399206).

Almost surely, 2^1000221216 is an apocalyptic number.

1000221216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1000221216 is an abundant number, since it is smaller than the sum of its proper divisors (1625359728).

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

1000221216 is a wasteful number, since it uses less digits than its factorization.

1000221216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10418984 (or 10418976 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1000221216 is about 31626.2741403410. The cubic root of 1000221216 is about 1000.0737332299.

Adding to 1000221216 its reverse (6121220001), we get a palindrome (7121441217).

The spelling of 1000221216 in words is "one billion, two hundred twenty-one thousand, two hundred sixteen".