21340360331 has 2 divisors, whose sum is σ = 21340360332. Its totient is φ = 21340360330.

The previous prime is 21340360277. The next prime is 21340360339. The reversal of 21340360331 is 13306304312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21340360331 - 2⁶ = 21340360267 is a prime.

It is a super-2 number, since 2×21340360331² (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 21340360331.

It is not a weakly prime, because it can be changed into another prime (21340360339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670180165 + 10670180166.

It is an arithmetic number, because the mean of its divisors is an integer number (10670180166).

Almost surely, 2^21340360331 is an apocalyptic number.

21340360331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340360331 is an equidigital number, since it uses as much as digits as its factorization.

21340360331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21340360331 its reverse (13306304312), we get a palindrome (34646664643).

The spelling of 21340360331 in words is "twenty-one billion, three hundred forty million, three hundred sixty thousand, three hundred thirty-one".