27921427297 has 4 divisors (see below), whose sum is σ = 27927004336. Its totient is φ = 27915850260.

The previous prime is 27921427279. The next prime is 27921427321. The reversal of 27921427297 is 79272412972.

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 27921427297 - 2¹¹ = 27921425249 is a prime.

It is a super-2 number, since 2×27921427297² (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 (27921427397) 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, 2781003 + ... + 2791024.

It is an arithmetic number, because the mean of its divisors is an integer number (6981751084).

Almost surely, 2^27921427297 is an apocalyptic number.

It is an amenable number.

27921427297 is a deficient number, since it is larger than the sum of its proper divisors (5577039).

27921427297 is an equidigital number, since it uses as much as digits as its factorization.

27921427297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5577038.

The product of its digits is 1778112, while the sum is 52.

The spelling of 27921427297 in words is "twenty-seven billion, nine hundred twenty-one million, four hundred twenty-seven thousand, two hundred ninety-seven".