20211233231 has 4 divisors (see below), whose sum is σ = 23098552272. Its totient is φ = 17323914192.

The previous prime is 20211233221. The next prime is 20211233243. The reversal of 20211233231 is 13233211202.

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 20211233231 - 2³⁰ = 19137491407 is a prime.

It is a super-2 number, since 2×20211233231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211233221) 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, 1443659510 + ... + 1443659523.

It is an arithmetic number, because the mean of its divisors is an integer number (5774638068).

Almost surely, 2^20211233231 is an apocalyptic number.

20211233231 is a deficient number, since it is larger than the sum of its proper divisors (2887319041).

20211233231 is an equidigital number, since it uses as much as digits as its factorization.

20211233231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887319040.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20211233231 its reverse (13233211202), we get a palindrome (33444444433).

The spelling of 20211233231 in words is "twenty billion, two hundred eleven million, two hundred thirty-three thousand, two hundred thirty-one".