20031143221 has 4 divisors (see below), whose sum is σ = 20052431244. Its totient is φ = 20009855200.

The previous prime is 20031143203. The next prime is 20031143317. The reversal of 20031143221 is 12234113002.

It is a happy number.

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 16665519025 + 3365624196 = 129095^2 + 58014^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031143221 - 2¹⁵ = 20031110453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031143021) 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, 10642600 + ... + 10644481.

It is an arithmetic number, because the mean of its divisors is an integer number (5013107811).

Almost surely, 2^20031143221 is an apocalyptic number.

It is an amenable number.

20031143221 is a deficient number, since it is larger than the sum of its proper divisors (21288023).

20031143221 is an equidigital number, since it uses as much as digits as its factorization.

20031143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21288022.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20031143221 its reverse (12234113002), we get a palindrome (32265256223).

The spelling of 20031143221 in words is "twenty billion, thirty-one million, one hundred forty-three thousand, two hundred twenty-one".