21331023127 has 2 divisors, whose sum is σ = 21331023128. Its totient is φ = 21331023126.

The previous prime is 21331023079. The next prime is 21331023191. The reversal of 21331023127 is 72132013312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331023127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331023827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665511563 + 10665511564.

It is an arithmetic number, because the mean of its divisors is an integer number (10665511564).

Almost surely, 2^21331023127 is an apocalyptic number.

21331023127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331023127 is an equidigital number, since it uses as much as digits as its factorization.

21331023127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21331023127 its reverse (72132013312), we get a palindrome (93463036439).

The spelling of 21331023127 in words is "twenty-one billion, three hundred thirty-one million, twenty-three thousand, one hundred twenty-seven".