111210123121 has 2 divisors, whose sum is σ = 111210123122. Its totient is φ = 111210123120.

The previous prime is 111210123109. The next prime is 111210123149. The reversal of 111210123121 is 121321012111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99880649521 + 11329473600 = 316039^2 + 106440^2 .

It is a cyclic number.

It is not a de Polignac number, because 111210123121 - 2⁷ = 111210122993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111210123095 and 111210123104.

It is not a weakly prime, because it can be changed into another prime (111210183121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605061560 + 55605061561.

It is an arithmetic number, because the mean of its divisors is an integer number (55605061561).

Almost surely, 2^111210123121 is an apocalyptic number.

It is an amenable number.

111210123121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111210123121 is an equidigital number, since it uses as much as digits as its factorization.

111210123121 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 16.

Adding to 111210123121 its reverse (121321012111), we get a palindrome (232531135232).

The spelling of 111210123121 in words is "one hundred eleven billion, two hundred ten million, one hundred twenty-three thousand, one hundred twenty-one".