21433411231 has 4 divisors (see below), whose sum is σ = 21502329264. Its totient is φ = 21364493200.

The previous prime is 21433411211. The next prime is 21433411243. The reversal of 21433411231 is 13211433412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21433411231 is a prime.

It is a super-2 number, since 2×21433411231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21433411196 and 21433411205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433411211) 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, 34458550 + ... + 34459171.

It is an arithmetic number, because the mean of its divisors is an integer number (5375582316).

Almost surely, 2^21433411231 is an apocalyptic number.

21433411231 is a deficient number, since it is larger than the sum of its proper divisors (68918033).

21433411231 is an equidigital number, since it uses as much as digits as its factorization.

21433411231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68918032.

The product of its digits is 1728, while the sum is 25.

Adding to 21433411231 its reverse (13211433412), we get a palindrome (34644844643).

The spelling of 21433411231 in words is "twenty-one billion, four hundred thirty-three million, four hundred eleven thousand, two hundred thirty-one".