1000221001 has 8 divisors (see below), whose sum is σ = 1078141064. Its totient is φ = 922440960.

The previous prime is 1000220999. The next prime is 1000221007. The reversal of 1000221001 is 1001220001.

It can be written as a sum of positive squares in 4 ways, for example, as 191102976 + 809118025 = 13824^2 + 28445^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1000221001 - 2¹ = 1000220999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1000221007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19920 + ... + 48961.

It is an arithmetic number, because the mean of its divisors is an integer number (134767633).

Almost surely, 2^1000221001 is an apocalyptic number.

It is an amenable number.

1000221001 is a deficient number, since it is larger than the sum of its proper divisors (77920063).

1000221001 is a wasteful number, since it uses less digits than its factorization.

1000221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70011.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1000221001 is about 31626.2707412682. The cubic root of 1000221001 is about 1000.0736615738.

Adding to 1000221001 its reverse (1001220001), we get a palindrome (2001441002).

The spelling of 1000221001 in words is "one billion, two hundred twenty-one thousand, one".