121121210123 has 2 divisors, whose sum is σ = 121121210124. Its totient is φ = 121121210122.

The previous prime is 121121210101. The next prime is 121121210201. The reversal of 121121210123 is 321012121121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (321012121121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121121210123 - 2⁶ = 121121210059 is a prime.

It is not a weakly prime, because it can be changed into another prime (121121210323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60560605061 + 60560605062.

It is an arithmetic number, because the mean of its divisors is an integer number (60560605062).

Almost surely, 2^121121210123 is an apocalyptic number.

121121210123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121121210123 is an equidigital number, since it uses as much as digits as its factorization.

121121210123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121121210123 its reverse (321012121121), we get a palindrome (442133331244).

The spelling of 121121210123 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty-three".