21230231333 has 4 divisors (see below), whose sum is σ = 21262350348. Its totient is φ = 21198112320.

The previous prime is 21230231299. The next prime is 21230231357. The reversal of 21230231333 is 33313203212.

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 8511354049 + 12718877284 = 92257^2 + 112778^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230231333 - 2¹² = 21230227237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21230231299 and 21230231308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230231833) 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, 16058516 + ... + 16059837.

It is an arithmetic number, because the mean of its divisors is an integer number (5315587587).

Almost surely, 2^21230231333 is an apocalyptic number.

It is an amenable number.

21230231333 is a deficient number, since it is larger than the sum of its proper divisors (32119015).

21230231333 is an equidigital number, since it uses as much as digits as its factorization.

21230231333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32119014.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21230231333 its reverse (33313203212), we get a palindrome (54543434545).

The spelling of 21230231333 in words is "twenty-one billion, two hundred thirty million, two hundred thirty-one thousand, three hundred thirty-three".