21213334231 has 2 divisors, whose sum is σ = 21213334232. Its totient is φ = 21213334230.

The previous prime is 21213334229. The next prime is 21213334237. The reversal of 21213334231 is 13243331212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213334231 - 2¹ = 21213334229 is a prime.

It is a super-2 number, since 2×21213334231² (a number of 21 digits) contains 22 as substring.

Together with 21213334229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21213334196 and 21213334205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213334237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606667115 + 10606667116.

It is an arithmetic number, because the mean of its divisors is an integer number (10606667116).

Almost surely, 2^21213334231 is an apocalyptic number.

21213334231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213334231 is an equidigital number, since it uses as much as digits as its factorization.

21213334231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 25.

Adding to 21213334231 its reverse (13243331212), we get a palindrome (34456665443).

The spelling of 21213334231 in words is "twenty-one billion, two hundred thirteen million, three hundred thirty-four thousand, two hundred thirty-one".