21123332117 has 2 divisors, whose sum is σ = 21123332118. Its totient is φ = 21123332116.

The previous prime is 21123332101. The next prime is 21123332119. The reversal of 21123332117 is 71123332112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14321866276 + 6801465841 = 119674^2 + 82471^2 .

It is a cyclic number.

It is not a de Polignac number, because 21123332117 - 2⁴ = 21123332101 is a prime.

Together with 21123332119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21123332119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561666058 + 10561666059.

It is an arithmetic number, because the mean of its divisors is an integer number (10561666059).

Almost surely, 2^21123332117 is an apocalyptic number.

It is an amenable number.

21123332117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123332117 is an equidigital number, since it uses as much as digits as its factorization.

21123332117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

Adding to 21123332117 its reverse (71123332112), we get a palindrome (92246664229).

The spelling of 21123332117 in words is "twenty-one billion, one hundred twenty-three million, three hundred thirty-two thousand, one hundred seventeen".