121973021 has 2 divisors, whose sum is σ = 121973022. Its totient is φ = 121973020.

The previous prime is 121973017. The next prime is 121973051. The reversal of 121973021 is 120379121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68244121 + 53728900 = 8261^2 + 7330^2 .

It is an emirp because it is prime and its reverse (120379121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121973021 - 2² = 121973017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121973051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60986510 + 60986511.

It is an arithmetic number, because the mean of its divisors is an integer number (60986511).

Almost surely, 2^121973021 is an apocalyptic number.

It is an amenable number.

121973021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121973021 is an equidigital number, since it uses as much as digits as its factorization.

121973021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 121973021 is about 11044.1396677152. The cubic root of 121973021 is about 495.9310043749.

The spelling of 121973021 in words is "one hundred twenty-one million, nine hundred seventy-three thousand, twenty-one".