27726320121 has 16 divisors (see below), whose sum is σ = 37860317568. Its totient is φ = 18043424000.

The previous prime is 27726320099. The next prime is 27726320129. The reversal of 27726320121 is 12102362772.

27726320121 = T₂₃₃₈₁ + T₂₃₃₈₂ + ... + T₂₃₄₈₁.

It is a cyclic number.

It is not a de Polignac number, because 27726320121 - 2¹⁵ = 27726287353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27726320129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 622896 + ... + 665921.

It is an arithmetic number, because the mean of its divisors is an integer number (2366269848).

Almost surely, 2^27726320121 is an apocalyptic number.

It is an amenable number.

27726320121 is a deficient number, since it is larger than the sum of its proper divisors (10133997447).

27726320121 is a wasteful number, since it uses less digits than its factorization.

27726320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288992.

The product of its (nonzero) digits is 14112, while the sum is 33.

Adding to 27726320121 its reverse (12102362772), we get a palindrome (39828682893).

The spelling of 27726320121 in words is "twenty-seven billion, seven hundred twenty-six million, three hundred twenty thousand, one hundred twenty-one".