27825783021 has 12 divisors (see below), whose sum is σ = 40219737948. Its totient is φ = 18538088064.

The previous prime is 27825782989. The next prime is 27825783023. The reversal of 27825783021 is 12038752872.

27825783021 is a `hidden beast` number, since 2 + 78 + 2 + 578 + 3 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9224642025 + 18601140996 = 96045^2 + 136386^2 .

It is not a de Polignac number, because 27825783021 - 2⁵ = 27825782989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27825783023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1021980 + ... + 1048853.

It is an arithmetic number, because the mean of its divisors is an integer number (3351644829).

Almost surely, 2^27825783021 is an apocalyptic number.

It is an amenable number.

27825783021 is a deficient number, since it is larger than the sum of its proper divisors (12393954927).

27825783021 is a wasteful number, since it uses less digits than its factorization.

27825783021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072332 (or 2072329 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 27825783021 in words is "twenty-seven billion, eight hundred twenty-five million, seven hundred eighty-three thousand, twenty-one".