27312566021 has 4 divisors (see below), whose sum is σ = 29413532652. Its totient is φ = 25211599392.

The previous prime is 27312566011. The next prime is 27312566023. The reversal of 27312566021 is 12066521372.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4065465121 + 23247100900 = 63761^2 + 152470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27312566021 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 (27312566023) 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, 1050483296 + ... + 1050483321.

It is an arithmetic number, because the mean of its divisors is an integer number (7353383163).

Almost surely, 2^27312566021 is an apocalyptic number.

It is an amenable number.

27312566021 is a deficient number, since it is larger than the sum of its proper divisors (2100966631).

27312566021 is a wasteful number, since it uses less digits than its factorization.

27312566021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100966630.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 27312566021 in words is "twenty-seven billion, three hundred twelve million, five hundred sixty-six thousand, twenty-one".