121002021222161 has 2 divisors, whose sum is σ = 121002021222162. Its totient is φ = 121002021222160.

The previous prime is 121002021222149. The next prime is 121002021222163. The reversal of 121002021222161 is 161222120200121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110616354839761 + 10385666382400 = 10517431^2 + 3222680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121002021222161 is a prime.

Together with 121002021222163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121002021222163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60501010611080 + 60501010611081.

It is an arithmetic number, because the mean of its divisors is an integer number (60501010611081).

Almost surely, 2^{121002021222161} is an apocalyptic number.

It is an amenable number.

121002021222161 is a deficient number, since it is larger than the sum of its proper divisors (1).

121002021222161 is an equidigital number, since it uses as much as digits as its factorization.

121002021222161 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 23.

Adding to 121002021222161 its reverse (161222120200121), we get a palindrome (282224141422282).

The spelling of 121002021222161 in words is "one hundred twenty-one trillion, two billion, twenty-one million, two hundred twenty-two thousand, one hundred sixty-one".