1212212021161 has 2 divisors, whose sum is σ = 1212212021162. Its totient is φ = 1212212021160.

The previous prime is 1212212021071. The next prime is 1212212021203. The reversal of 1212212021161 is 1611202122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 812053299600 + 400158721561 = 901140^2 + 632581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212212021161 - 2¹⁷ = 1212211890089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212212025161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606106010580 + 606106010581.

It is an arithmetic number, because the mean of its divisors is an integer number (606106010581).

Almost surely, 2^{1212212021161} is an apocalyptic number.

It is an amenable number.

1212212021161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212212021161 is an equidigital number, since it uses as much as digits as its factorization.

1212212021161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 1212212021161 its reverse (1611202122121), we get a palindrome (2823414143282).

The spelling of 1212212021161 in words is "one trillion, two hundred twelve billion, two hundred twelve million, twenty-one thousand, one hundred sixty-one".