26810132821 has 4 divisors (see below), whose sum is σ = 26818490700. Its totient is φ = 26801774944.

The previous prime is 26810132809. The next prime is 26810132857. The reversal of 26810132821 is 12823101862.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8819275921 + 17990856900 = 93911^2 + 134130^2 .

It is a cyclic number.

It is not a de Polignac number, because 26810132821 - 2¹⁷ = 26810001749 is a prime.

It is a super-2 number, since 2×26810132821² (a number of 22 digits) contains 22 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 (26810139821) 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, 4174126 + ... + 4180543.

It is an arithmetic number, because the mean of its divisors is an integer number (6704622675).

Almost surely, 2^26810132821 is an apocalyptic number.

It is an amenable number.

26810132821 is a deficient number, since it is larger than the sum of its proper divisors (8357879).

26810132821 is an equidigital number, since it uses as much as digits as its factorization.

26810132821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8357878.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 26810132821 in words is "twenty-six billion, eight hundred ten million, one hundred thirty-two thousand, eight hundred twenty-one".