121121321023 has 2 divisors, whose sum is σ = 121121321024. Its totient is φ = 121121321022.

The previous prime is 121121321021. The next prime is 121121321051. The reversal of 121121321023 is 320123121121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121121321023 - 2¹ = 121121321021 is a prime.

Together with 121121321021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121121321021) 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, 60560660511 + 60560660512.

It is an arithmetic number, because the mean of its divisors is an integer number (60560660512).

Almost surely, 2^121121321023 is an apocalyptic number.

121121321023 is a deficient number, since it is larger than the sum of its proper divisors (1).

121121321023 is an equidigital number, since it uses as much as digits as its factorization.

121121321023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121121321023 its reverse (320123121121), we get a palindrome (441244442144).

The spelling of 121121321023 in words is "one hundred twenty-one billion, one hundred twenty-one million, three hundred twenty-one thousand, twenty-three".