1212220202161 has 2 divisors, whose sum is σ = 1212220202162. Its totient is φ = 1212220202160.

The previous prime is 1212220202147. The next prime is 1212220202197. The reversal of 1212220202161 is 1612020222121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1183839745936 + 28380456225 = 1088044^2 + 168465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212220202161 - 2⁷ = 1212220202033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212220202261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110101080 + 606110101081.

It is an arithmetic number, because the mean of its divisors is an integer number (606110101081).

Almost surely, 2^{1212220202161} is an apocalyptic number.

It is an amenable number.

1212220202161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212220202161 is an equidigital number, since it uses as much as digits as its factorization.

1212220202161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 1212220202161 its reverse (1612020222121), we get a palindrome (2824240424282).

The spelling of 1212220202161 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred two thousand, one hundred sixty-one".