21117026273 has 4 divisors (see below), whose sum is σ = 24133744320. Its totient is φ = 18100308228.

The previous prime is 21117026233. The next prime is 21117026297. The reversal of 21117026273 is 37262071112.

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 21117026273 - 2⁶ = 21117026209 is a prime.

It is a super-2 number, since 2×21117026273² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21117026233) 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, 1508359013 + ... + 1508359026.

It is an arithmetic number, because the mean of its divisors is an integer number (6033436080).

Almost surely, 2^21117026273 is an apocalyptic number.

It is an amenable number.

21117026273 is a deficient number, since it is larger than the sum of its proper divisors (3016718047).

21117026273 is an equidigital number, since it uses as much as digits as its factorization.

21117026273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016718046.

The product of its (nonzero) digits is 7056, while the sum is 32.

Adding to 21117026273 its reverse (37262071112), we get a palindrome (58379097385).

The spelling of 21117026273 in words is "twenty-one billion, one hundred seventeen million, twenty-six thousand, two hundred seventy-three".