1000221663 has 12 divisors (see below), whose sum is σ = 1551364440. Its totient is φ = 571555152.

The previous prime is 1000221637. The next prime is 1000221683. The reversal of 1000221663 is 3661220001.

It is a happy number.

It is not a de Polignac number, because 1000221663 - 2¹³ = 1000213471 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000221623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3401968 + ... + 3402261.

It is an arithmetic number, because the mean of its divisors is an integer number (129280370).

Almost surely, 2^1000221663 is an apocalyptic number.

1000221663 is a deficient number, since it is larger than the sum of its proper divisors (551142777).

1000221663 is an equidigital number, since it uses as much as digits as its factorization.

1000221663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804246 (or 6804239 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1000221663 is about 31626.2812072491. The cubic root of 1000221663 is about 1000.0738822080.

Adding to 1000221663 its reverse (3661220001), we get a palindrome (4661441664).

The spelling of 1000221663 in words is "one billion, two hundred twenty-one thousand, six hundred sixty-three".