1000121022161 has 2 divisors, whose sum is σ = 1000121022162. Its totient is φ = 1000121022160.

The previous prime is 1000121022157. The next prime is 1000121022209. The reversal of 1000121022161 is 1612201210001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983183301136 + 16937721025 = 991556^2 + 130145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000121022161 - 2² = 1000121022157 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000121022151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500060511080 + 500060511081.

It is an arithmetic number, because the mean of its divisors is an integer number (500060511081).

Almost surely, 2^{1000121022161} is an apocalyptic number.

It is an amenable number.

1000121022161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000121022161 is an equidigital number, since it uses as much as digits as its factorization.

1000121022161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1000121022161 its reverse (1612201210001), we get a palindrome (2612322232162).

The spelling of 1000121022161 in words is "one trillion, one hundred twenty-one million, twenty-two thousand, one hundred sixty-one".