21331031363 has 2 divisors, whose sum is σ = 21331031364. Its totient is φ = 21331031362.

The previous prime is 21331031297. The next prime is 21331031377. The reversal of 21331031363 is 36313013312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21331031363 - 2⁸ = 21331031107 is a prime.

It is not a weakly prime, because it can be changed into another prime (21331031063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665515681 + 10665515682.

It is an arithmetic number, because the mean of its divisors is an integer number (10665515682).

Almost surely, 2^21331031363 is an apocalyptic number.

21331031363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331031363 is an equidigital number, since it uses as much as digits as its factorization.

21331031363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 26.

Adding to 21331031363 its reverse (36313013312), we get a palindrome (57644044675).

The spelling of 21331031363 in words is "twenty-one billion, three hundred thirty-one million, thirty-one thousand, three hundred sixty-three".