27920684321 has 4 divisors (see below), whose sum is σ = 28257078192. Its totient is φ = 27584290452.

The previous prime is 27920684291. The next prime is 27920684327. The reversal of 27920684321 is 12348602972.

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 27920684321 - 2²⁶ = 27853575457 is a prime.

It is a super-2 number, since 2×27920684321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27920684327) 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, 168196811 + ... + 168196976.

It is an arithmetic number, because the mean of its divisors is an integer number (7064269548).

Almost surely, 2^27920684321 is an apocalyptic number.

It is an amenable number.

27920684321 is a deficient number, since it is larger than the sum of its proper divisors (336393871).

27920684321 is an equidigital number, since it uses as much as digits as its factorization.

27920684321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336393870.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 27920684321 in words is "twenty-seven billion, nine hundred twenty million, six hundred eighty-four thousand, three hundred twenty-one".