1221331012127 has 2 divisors, whose sum is σ = 1221331012128. Its totient is φ = 1221331012126.

The previous prime is 1221331012079. The next prime is 1221331012141. The reversal of 1221331012127 is 7212101331221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221331012127 - 2⁶ = 1221331012063 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221331012096 and 1221331012105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221331012147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610665506063 + 610665506064.

It is an arithmetic number, because the mean of its divisors is an integer number (610665506064).

Almost surely, 2^{1221331012127} is an apocalyptic number.

1221331012127 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221331012127 is an equidigital number, since it uses as much as digits as its factorization.

1221331012127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

Adding to 1221331012127 its reverse (7212101331221), we get a palindrome (8433432343348).

The spelling of 1221331012127 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, twelve thousand, one hundred twenty-seven".