21333133231 has 2 divisors, whose sum is σ = 21333133232. Its totient is φ = 21333133230.

The previous prime is 21333133193. The next prime is 21333133249. The reversal of 21333133231 is 13233133312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21333133231 - 2¹⁹ = 21332608943 is a prime.

It is a super-2 number, since 2×21333133231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21333133196 and 21333133205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21333133531) 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 as a sum of consecutive naturals, namely, 10666566615 + 10666566616.

It is an arithmetic number, because the mean of its divisors is an integer number (10666566616).

Almost surely, 2^21333133231 is an apocalyptic number.

21333133231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333133231 is an equidigital number, since it uses as much as digits as its factorization.

21333133231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 25.

Adding to 21333133231 its reverse (13233133312), we get a palindrome (34566266543).

The spelling of 21333133231 in words is "twenty-one billion, three hundred thirty-three million, one hundred thirty-three thousand, two hundred thirty-one".