121123021 has 2 divisors, whose sum is σ = 121123022. Its totient is φ = 121123020.

The previous prime is 121123007. The next prime is 121123031. The reversal of 121123021 is 120321121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121110025 + 12996 = 11005^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 121123021 - 2¹⁵ = 121090253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121122992 and 121123010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121123001) 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, 60561510 + 60561511.

It is an arithmetic number, because the mean of its divisors is an integer number (60561511).

Almost surely, 2^121123021 is an apocalyptic number.

It is an amenable number.

121123021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121123021 is an equidigital number, since it uses as much as digits as its factorization.

121123021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 121123021 is about 11005.5904430430. The cubic root of 121123021 is about 494.7763108615.

Adding to 121123021 its reverse (120321121), we get a palindrome (241444142).

The spelling of 121123021 in words is "one hundred twenty-one million, one hundred twenty-three thousand, twenty-one".