121434644021 has 2 divisors, whose sum is σ = 121434644022. Its totient is φ = 121434644020.

The previous prime is 121434643999. The next prime is 121434644053. The reversal of 121434644021 is 120446434121.

It is an a-pointer prime, because the next prime (121434644053) can be obtained adding 121434644021 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88488400900 + 32946243121 = 297470^2 + 181511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121434644021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121434641021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60717322010 + 60717322011.

It is an arithmetic number, because the mean of its divisors is an integer number (60717322011).

Almost surely, 2^121434644021 is an apocalyptic number.

It is an amenable number.

121434644021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121434644021 is an equidigital number, since it uses as much as digits as its factorization.

121434644021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 32.

The spelling of 121434644021 in words is "one hundred twenty-one billion, four hundred thirty-four million, six hundred forty-four thousand, twenty-one".