21038362117 has 2 divisors, whose sum is σ = 21038362118. Its totient is φ = 21038362116.

The previous prime is 21038362109. The next prime is 21038362139. The reversal of 21038362117 is 71126383012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17979055396 + 3059306721 = 134086^2 + 55311^2 .

It is a cyclic number.

It is not a de Polignac number, because 21038362117 - 2³ = 21038362109 is a prime.

It is a super-2 number, since 2×21038362117² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21038362217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519181058 + 10519181059.

It is an arithmetic number, because the mean of its divisors is an integer number (10519181059).

Almost surely, 2^21038362117 is an apocalyptic number.

It is an amenable number.

21038362117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21038362117 is an equidigital number, since it uses as much as digits as its factorization.

21038362117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 21038362117 in words is "twenty-one billion, thirty-eight million, three hundred sixty-two thousand, one hundred seventeen".