27243756121 has 8 divisors (see below), whose sum is σ = 27993223944. Its totient is φ = 26494980480.

The previous prime is 27243756083. The next prime is 27243756191. The reversal of 27243756121 is 12165734272.

It can be written as a sum of positive squares in 4 ways, for example, as 13317160000 + 13926596121 = 115400^2 + 118011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27243756121 - 2¹³ = 27243747929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27243756191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92740 + ... + 251173.

It is an arithmetic number, because the mean of its divisors is an integer number (3499152993).

Almost surely, 2^27243756121 is an apocalyptic number.

It is an amenable number.

27243756121 is a deficient number, since it is larger than the sum of its proper divisors (749467823).

27243756121 is a wasteful number, since it uses less digits than its factorization.

27243756121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346091.

The product of its digits is 141120, while the sum is 40.

The spelling of 27243756121 in words is "twenty-seven billion, two hundred forty-three million, seven hundred fifty-six thousand, one hundred twenty-one".