1000221203021 has 4 divisors (see below), whose sum is σ = 1000261544700. Its totient is φ = 1000180861344.

The previous prime is 1000221203011. The next prime is 1000221203041. The reversal of 1000221203021 is 1203021220001.

It is a happy number.

1000221203021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 871814364100 + 128406838921 = 933710^2 + 358339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000221203021 - 2¹⁰ = 1000221201997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1000221202987 and 1000221203005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000221203011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20133626 + ... + 20183243.

It is an arithmetic number, because the mean of its divisors is an integer number (250065386175).

Almost surely, 2^{1000221203021} is an apocalyptic number.

It is an amenable number.

1000221203021 is a deficient number, since it is larger than the sum of its proper divisors (40341679).

1000221203021 is an equidigital number, since it uses as much as digits as its factorization.

1000221203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40341678.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1000221203021 its reverse (1203021220001), we get a palindrome (2203242423022).

The spelling of 1000221203021 in words is "one trillion, two hundred twenty-one million, two hundred three thousand, twenty-one".