21304115117 has 4 divisors (see below), whose sum is σ = 21305274816. Its totient is φ = 21302955420.

The previous prime is 21304115081. The next prime is 21304115149. The reversal of 21304115117 is 71151140312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21304115117 - 2¹² = 21304111021 is a prime.

It is a super-3 number, since 3×21304115117³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304115167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551843 + ... + 589184.

It is an arithmetic number, because the mean of its divisors is an integer number (5326318704).

Almost surely, 2^21304115117 is an apocalyptic number.

It is an amenable number.

21304115117 is a deficient number, since it is larger than the sum of its proper divisors (1159699).

21304115117 is a wasteful number, since it uses less digits than its factorization.

21304115117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159698.

The product of its (nonzero) digits is 840, while the sum is 26.

Adding to 21304115117 its reverse (71151140312), we get a palindrome (92455255429).

The spelling of 21304115117 in words is "twenty-one billion, three hundred four million, one hundred fifteen thousand, one hundred seventeen".