27248216921 has 4 divisors (see below), whose sum is σ = 27365162292. Its totient is φ = 27131271552.

The previous prime is 27248216917. The next prime is 27248216929. The reversal of 27248216921 is 12961284272.

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 14510611600 + 12737605321 = 120460^2 + 112861^2 .

It is a cyclic number.

It is not a de Polignac number, because 27248216921 - 2² = 27248216917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27248216929) 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, 58472336 + ... + 58472801.

It is an arithmetic number, because the mean of its divisors is an integer number (6841290573).

Almost surely, 2^27248216921 is an apocalyptic number.

It is an amenable number.

27248216921 is a deficient number, since it is larger than the sum of its proper divisors (116945371).

27248216921 is a wasteful number, since it uses less digits than its factorization.

27248216921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116945370.

The product of its digits is 193536, while the sum is 44.

The spelling of 27248216921 in words is "twenty-seven billion, two hundred forty-eight million, two hundred sixteen thousand, nine hundred twenty-one".