1210105121 has 2 divisors, whose sum is σ = 1210105122. Its totient is φ = 1210105120.

The previous prime is 1210105109. The next prime is 1210105147. The reversal of 1210105121 is 1215010121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1143454225 + 66650896 = 33815^2 + 8164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210105121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210105096 and 1210105105.

It is not a weakly prime, because it can be changed into another prime (1210105151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605052560 + 605052561.

It is an arithmetic number, because the mean of its divisors is an integer number (605052561).

Almost surely, 2^1210105121 is an apocalyptic number.

It is an amenable number.

1210105121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210105121 is an equidigital number, since it uses as much as digits as its factorization.

1210105121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 1210105121 is about 34786.5652371717. The cubic root of 1210105121 is about 1065.6330945983.

Adding to 1210105121 its reverse (1215010121), we get a palindrome (2425115242).

The spelling of 1210105121 in words is "one billion, two hundred ten million, one hundred five thousand, one hundred twenty-one".