1220111210077 has 2 divisors, whose sum is σ = 1220111210078. Its totient is φ = 1220111210076.

The previous prime is 1220111210057. The next prime is 1220111210183. The reversal of 1220111210077 is 7700121110221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1219546957561 + 564252516 = 1104331^2 + 23754^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220111210077 is a prime.

It is a super-2 number, since 2×1220111210077² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220111210027) 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 as a sum of consecutive naturals, namely, 610055605038 + 610055605039.

It is an arithmetic number, because the mean of its divisors is an integer number (610055605039).

Almost surely, 2^{1220111210077} is an apocalyptic number.

It is an amenable number.

1220111210077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220111210077 is an equidigital number, since it uses as much as digits as its factorization.

1220111210077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 25.

Adding to 1220111210077 its reverse (7700121110221), we get a palindrome (8920232320298).

The spelling of 1220111210077 in words is "one trillion, two hundred twenty billion, one hundred eleven million, two hundred ten thousand, seventy-seven".