26316974921 has 4 divisors (see below), whose sum is σ = 26634046992. Its totient is φ = 25999902852.

The previous prime is 26316974891. The next prime is 26316974927. The reversal of 26316974921 is 12947961362.

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 26316974921 - 2⁶ = 26316974857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26316974921.

It is not an unprimeable number, because it can be changed into a prime (26316974927) 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, 158535911 + ... + 158536076.

It is an arithmetic number, because the mean of its divisors is an integer number (6658511748).

Almost surely, 2^26316974921 is an apocalyptic number.

It is an amenable number.

26316974921 is a deficient number, since it is larger than the sum of its proper divisors (317072071).

26316974921 is an equidigital number, since it uses as much as digits as its factorization.

26316974921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317072070.

The product of its digits is 979776, while the sum is 50.

The spelling of 26316974921 in words is "twenty-six billion, three hundred sixteen million, nine hundred seventy-four thousand, nine hundred twenty-one".