121001221021 has 2 divisors, whose sum is σ = 121001221022. Its totient is φ = 121001221020.

The previous prime is 121001221007. The next prime is 121001221037. The reversal of 121001221021 is 120122100121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100862772921 + 20138448100 = 317589^2 + 141910^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001221021 - 2²⁹ = 120464350109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121001220992 and 121001221010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121001221051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500610510 + 60500610511.

It is an arithmetic number, because the mean of its divisors is an integer number (60500610511).

Almost surely, 2^121001221021 is an apocalyptic number.

It is an amenable number.

121001221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121001221021 is an equidigital number, since it uses as much as digits as its factorization.

121001221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121001221021 its reverse (120122100121), we get a palindrome (241123321142).

The spelling of 121001221021 in words is "one hundred twenty-one billion, one million, two hundred twenty-one thousand, twenty-one".