27047420521 has 9 divisors (see below), whose sum is σ = 29731797949. Its totient is φ = 24586919500.

The previous prime is 27047420513. The next prime is 27047420527. The reversal of 27047420521 is 12502474072.

The square root of 27047420521 is 164461.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 27047420521 - 2³ = 27047420513 is a prime.

It is a super-2 number, since 2×27047420521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27047420527) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1801596 + ... + 1816546.

Almost surely, 2^27047420521 is an apocalyptic number.

27047420521 is the 164461-st square number.

27047420521 is the 82231-st centered octagonal number.

It is an amenable number.

27047420521 is a deficient number, since it is larger than the sum of its proper divisors (2684377428).

27047420521 is an frugal number, since it uses more digits than its factorization.

27047420521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29924 (or 14962 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 34.

Adding to 27047420521 its reverse (12502474072), we get a palindrome (39549894593).

The spelling of 27047420521 in words is "twenty-seven billion, forty-seven million, four hundred twenty thousand, five hundred twenty-one".