1001000020221 has 24 divisors (see below), whose sum is σ = 1511247023104. Its totient is φ = 662078733120.

The previous prime is 1001000020187. The next prime is 1001000020303. The reversal of 1001000020221 is 1220200001001.

It is not a de Polignac number, because 1001000020221 - 2¹⁴ = 1001000003837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001000020021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16187020 + ... + 16248741.

Almost surely, 2^{1001000020221} is an apocalyptic number.

It is an amenable number.

1001000020221 is a deficient number, since it is larger than the sum of its proper divisors (510247002883).

1001000020221 is an equidigital number, since it uses as much as digits as its factorization.

1001000020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32435903 (or 32435891 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1001000020221 its reverse (1220200001001), we get a palindrome (2221200021222).

The spelling of 1001000020221 in words is "one trillion, one billion, twenty thousand, two hundred twenty-one".