27021572681 has 4 divisors (see below), whose sum is σ = 27649981392. Its totient is φ = 26393163972.

The previous prime is 27021572671. The next prime is 27021572693. The reversal of 27021572681 is 18627512072.

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 a de Polignac number, because none of the positive numbers 2^k-27021572681 is a prime.

It is a super-2 number, since 2×27021572681² (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 (27021572671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314204291 + ... + 314204376.

It is an arithmetic number, because the mean of its divisors is an integer number (6912495348).

Almost surely, 2^27021572681 is an apocalyptic number.

It is an amenable number.

27021572681 is a deficient number, since it is larger than the sum of its proper divisors (628408711).

27021572681 is an equidigital number, since it uses as much as digits as its factorization.

27021572681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628408710.

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 27021572681 in words is "twenty-seven billion, twenty-one million, five hundred seventy-two thousand, six hundred eighty-one".