20031232220291 has 4 divisors (see below), whose sum is σ = 20031257222472. Its totient is φ = 20031207218112.

The previous prime is 20031232220281. The next prime is 20031232220297. The reversal of 20031232220291 is 19202223213002.

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

It is a cyclic number.

It is not a de Polignac number, because 20031232220291 - 2¹⁰ = 20031232219267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031232220297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11258126 + ... + 12915411.

It is an arithmetic number, because the mean of its divisors is an integer number (5007814305618).

Almost surely, 2^{20031232220291} is an apocalyptic number.

20031232220291 is a deficient number, since it is larger than the sum of its proper divisors (25002181).

20031232220291 is an equidigital number, since it uses as much as digits as its factorization.

20031232220291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25002180.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 20031232220291 its reverse (19202223213002), we get a palindrome (39233455433293).

The spelling of 20031232220291 in words is "twenty trillion, thirty-one billion, two hundred thirty-two million, two hundred twenty thousand, two hundred ninety-one".