27312477021 has 32 divisors (see below), whose sum is σ = 40866186240. Its totient is φ = 18027500400.

The previous prime is 27312476993. The next prime is 27312477041. The reversal of 27312477021 is 12077421372.

It is not a de Polignac number, because 27312477021 - 2⁹ = 27312476509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27312477041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1558176 + ... + 1575606.

It is an arithmetic number, because the mean of its divisors is an integer number (1277068320).

Almost surely, 2^27312477021 is an apocalyptic number.

It is an amenable number.

27312477021 is a deficient number, since it is larger than the sum of its proper divisors (13553709219).

27312477021 is a wasteful number, since it uses less digits than its factorization.

27312477021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18014 (or 18008 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

Adding to 27312477021 its reverse (12077421372), we get a palindrome (39389898393).

The spelling of 27312477021 in words is "twenty-seven billion, three hundred twelve million, four hundred seventy-seven thousand, twenty-one".