26864400021 has 4 divisors (see below), whose sum is σ = 35819200032. Its totient is φ = 17909600012.

The previous prime is 26864399983. The next prime is 26864400047. The reversal of 26864400021 is 12000446862.

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 26864400021 - 2⁹ = 26864399509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26864400091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4477400001 + ... + 4477400006.

It is an arithmetic number, because the mean of its divisors is an integer number (8954800008).

Almost surely, 2^26864400021 is an apocalyptic number.

It is an amenable number.

26864400021 is a deficient number, since it is larger than the sum of its proper divisors (8954800011).

26864400021 is an equidigital number, since it uses as much as digits as its factorization.

26864400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8954800010.

The product of its (nonzero) digits is 18432, while the sum is 33.

Adding to 26864400021 its reverse (12000446862), we get a palindrome (38864846883).

The spelling of 26864400021 in words is "twenty-six billion, eight hundred sixty-four million, four hundred thousand, twenty-one".