21403013117 has 2 divisors, whose sum is σ = 21403013118. Its totient is φ = 21403013116.

The previous prime is 21403013089. The next prime is 21403013129. The reversal of 21403013117 is 71131030412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16971315076 + 4431698041 = 130274^2 + 66571^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403013117 - 2²⁴ = 21386235901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21403013092 and 21403013101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21403013197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701506558 + 10701506559.

It is an arithmetic number, because the mean of its divisors is an integer number (10701506559).

Almost surely, 2^21403013117 is an apocalyptic number.

It is an amenable number.

21403013117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403013117 is an equidigital number, since it uses as much as digits as its factorization.

21403013117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

Adding to 21403013117 its reverse (71131030412), we get a palindrome (92534043529).

The spelling of 21403013117 in words is "twenty-one billion, four hundred three million, thirteen thousand, one hundred seventeen".