21233113117 has 2 divisors, whose sum is σ = 21233113118. Its totient is φ = 21233113116.

The previous prime is 21233113103. The next prime is 21233113157. The reversal of 21233113117 is 71131133212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19305990916 + 1927122201 = 138946^2 + 43899^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233113117 - 2¹¹ = 21233111069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21233113091 and 21233113100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233113157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616556558 + 10616556559.

It is an arithmetic number, because the mean of its divisors is an integer number (10616556559).

Almost surely, 2^21233113117 is an apocalyptic number.

It is an amenable number.

21233113117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233113117 is an equidigital number, since it uses as much as digits as its factorization.

21233113117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

Adding to 21233113117 its reverse (71131133212), we get a palindrome (92364246329).

The spelling of 21233113117 in words is "twenty-one billion, two hundred thirty-three million, one hundred thirteen thousand, one hundred seventeen".