1221220111127 has 2 divisors, whose sum is σ = 1221220111128. Its totient is φ = 1221220111126.

The previous prime is 1221220111103. The next prime is 1221220111201. The reversal of 1221220111127 is 7211110221221.

It is a weak prime.

It is an emirp because it is prime and its reverse (7211110221221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221220111127 - 2⁶ = 1221220111063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221220111427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610055563 + 610610055564.

It is an arithmetic number, because the mean of its divisors is an integer number (610610055564).

Almost surely, 2^{1221220111127} is an apocalyptic number.

1221220111127 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221220111127 is an equidigital number, since it uses as much as digits as its factorization.

1221220111127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 1221220111127 its reverse (7211110221221), we get a palindrome (8432330332348).

The spelling of 1221220111127 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, one hundred twenty-seven".