26708791221 has 48 divisors (see below), whose sum is σ = 44996290560. Its totient is φ = 14949642240.

The previous prime is 26708791201. The next prime is 26708791223. The reversal of 26708791221 is 12219780762.

It is a happy number.

26708791221 is a `hidden beast` number, since 267 + 0 + 87 + 91 + 221 = 666.

It is not a de Polignac number, because 26708791221 - 2⁹ = 26708790709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26708791223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2134060 + ... + 2146538.

It is an arithmetic number, because the mean of its divisors is an integer number (937422720).

Almost surely, 2^26708791221 is an apocalyptic number.

26708791221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26708791221 is a deficient number, since it is larger than the sum of its proper divisors (18287499339).

26708791221 is a wasteful number, since it uses less digits than its factorization.

26708791221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13186 (or 13183 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 26708791221 in words is "twenty-six billion, seven hundred eight million, seven hundred ninety-one thousand, two hundred twenty-one".