26404531021 has 16 divisors (see below), whose sum is σ = 30393115200. Its totient is φ = 22686652800.

The previous prime is 26404531009. The next prime is 26404531033. The reversal of 26404531021 is 12013540462.

It is an interprime number because it is at equal distance from previous prime (26404531009) and next prime (26404531033).

It is a cyclic number.

It is not a de Polignac number, because 26404531021 - 2⁵ = 26404530989 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 (26404535021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62056 + ... + 238033.

It is an arithmetic number, because the mean of its divisors is an integer number (1899569700).

Almost surely, 2^26404531021 is an apocalyptic number.

It is an amenable number.

26404531021 is a deficient number, since it is larger than the sum of its proper divisors (3988584179).

26404531021 is a wasteful number, since it uses less digits than its factorization.

26404531021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300540.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 26404531021 in words is "twenty-six billion, four hundred four million, five hundred thirty-one thousand, twenty-one".