21344332231 has 2 divisors, whose sum is σ = 21344332232. Its totient is φ = 21344332230.

The previous prime is 21344332211. The next prime is 21344332267. The reversal of 21344332231 is 13223344312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21344332231 - 2¹⁹ = 21343807943 is a prime.

It is a super-2 number, since 2×21344332231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21344332231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21344332211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672166115 + 10672166116.

It is an arithmetic number, because the mean of its divisors is an integer number (10672166116).

Almost surely, 2^21344332231 is an apocalyptic number.

21344332231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344332231 is an equidigital number, since it uses as much as digits as its factorization.

21344332231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 28.

Adding to 21344332231 its reverse (13223344312), we get a palindrome (34567676543).

The spelling of 21344332231 in words is "twenty-one billion, three hundred forty-four million, three hundred thirty-two thousand, two hundred thirty-one".