27724451121 has 16 divisors (see below), whose sum is σ = 41077477120. Its totient is φ = 18481070160.

The previous prime is 27724451113. The next prime is 27724451147. The reversal of 27724451121 is 12115442772.

27724451121 is a `hidden beast` number, since 27 + 72 + 445 + 1 + 121 = 666.

It is not a de Polignac number, because 27724451121 - 2³ = 27724451113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27724451191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245976 + ... + 340518.

It is an arithmetic number, because the mean of its divisors is an integer number (2567342320).

Almost surely, 2^27724451121 is an apocalyptic number.

It is an amenable number.

27724451121 is a deficient number, since it is larger than the sum of its proper divisors (13353025999).

27724451121 is a wasteful number, since it uses less digits than its factorization.

27724451121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105413 (or 105407 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

Adding to 27724451121 its reverse (12115442772), we get a palindrome (39839893893).

The spelling of 27724451121 in words is "twenty-seven billion, seven hundred twenty-four million, four hundred fifty-one thousand, one hundred twenty-one".