27751741021 has 4 divisors (see below), whose sum is σ = 27752677312. Its totient is φ = 27750804732.

The previous prime is 27751740979. The next prime is 27751741027. The reversal of 27751741021 is 12014715772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27751741021 - 2²¹ = 27749643869 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 (27751741027) 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, 422181 + ... + 483466.

It is an arithmetic number, because the mean of its divisors is an integer number (6938169328).

Almost surely, 2^27751741021 is an apocalyptic number.

It is an amenable number.

27751741021 is a deficient number, since it is larger than the sum of its proper divisors (936291).

27751741021 is an equidigital number, since it uses as much as digits as its factorization.

27751741021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936290.

The product of its (nonzero) digits is 27440, while the sum is 37.

The spelling of 27751741021 in words is "twenty-seven billion, seven hundred fifty-one million, seven hundred forty-one thousand, twenty-one".