26307055021 has 4 divisors (see below), whose sum is σ = 28330674652. Its totient is φ = 24283435392.

The previous prime is 26307055007. The next prime is 26307055039. The reversal of 26307055021 is 12055070362.

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 1590813225 + 24716241796 = 39885^2 + 157214^2 .

It is a cyclic number.

It is not a de Polignac number, because 26307055021 - 2²⁹ = 25770184109 is a prime.

It is a super-2 number, since 2×26307055021² (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 (26307055091) 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, 1011809796 + ... + 1011809821.

It is an arithmetic number, because the mean of its divisors is an integer number (7082668663).

Almost surely, 2^26307055021 is an apocalyptic number.

It is an amenable number.

26307055021 is a deficient number, since it is larger than the sum of its proper divisors (2023619631).

26307055021 is a wasteful number, since it uses less digits than its factorization.

26307055021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023619630.

The product of its (nonzero) digits is 12600, while the sum is 31.

The spelling of 26307055021 in words is "twenty-six billion, three hundred seven million, fifty-five thousand, twenty-one".