26989107421 has 4 divisors (see below), whose sum is σ = 26989460992. Its totient is φ = 26988753852.

The previous prime is 26989107413. The next prime is 26989107449. The reversal of 26989107421 is 12470198962.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 26989107421 - 2³ = 26989107413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26989107121) 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, 9555 + ... + 232528.

It is an arithmetic number, because the mean of its divisors is an integer number (6747365248).

Almost surely, 2^26989107421 is an apocalyptic number.

It is an amenable number.

26989107421 is a deficient number, since it is larger than the sum of its proper divisors (353571).

26989107421 is a wasteful number, since it uses less digits than its factorization.

26989107421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353570.

The product of its (nonzero) digits is 435456, while the sum is 49.

It can be divided in two parts, 2698 and 9107421, that added together give a palindrome (9110119).

The spelling of 26989107421 in words is "twenty-six billion, nine hundred eighty-nine million, one hundred seven thousand, four hundred twenty-one".