26405449360921 has 36 divisors (see below), whose sum is σ = 28321670587392. Its totient is φ = 24613843201024.

The previous prime is 26405449360909. The next prime is 26405449360931. The reversal of 26405449360921 is 12906394450462.

It is not a de Polignac number, because 26405449360921 - 2⁵ = 26405449360889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26405449360931) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9827110440 + ... + 9827113126.

It is an arithmetic number, because the mean of its divisors is an integer number (786713071872).

Almost surely, 2^{26405449360921} is an apocalyptic number.

It is an amenable number.

26405449360921 is a deficient number, since it is larger than the sum of its proper divisors (1916221226471).

26405449360921 is a wasteful number, since it uses less digits than its factorization.

26405449360921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5610 (or 5480 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 55.

The spelling of 26405449360921 in words is "twenty-six trillion, four hundred five billion, four hundred forty-nine million, three hundred sixty thousand, nine hundred twenty-one".