1220212101161 has 2 divisors, whose sum is σ = 1220212101162. Its totient is φ = 1220212101160.

The previous prime is 1220212101091. The next prime is 1220212101253. The reversal of 1220212101161 is 1611012120221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1092526657600 + 127685443561 = 1045240^2 + 357331^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220212101161 - 2³⁰ = 1219138359337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220217101161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610106050580 + 610106050581.

It is an arithmetic number, because the mean of its divisors is an integer number (610106050581).

Almost surely, 2^{1220212101161} is an apocalyptic number.

It is an amenable number.

1220212101161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220212101161 is an equidigital number, since it uses as much as digits as its factorization.

1220212101161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1220212101161 its reverse (1611012120221), we get a palindrome (2831224221382).

The spelling of 1220212101161 in words is "one trillion, two hundred twenty billion, two hundred twelve million, one hundred one thousand, one hundred sixty-one".