1210705121 has 2 divisors, whose sum is σ = 1210705122. Its totient is φ = 1210705120.

The previous prime is 1210705051. The next prime is 1210705123. The reversal of 1210705121 is 1215070121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767013025 + 443692096 = 27695^2 + 21064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210705121 - 2²² = 1206510817 is a prime.

Together with 1210705123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210705093 and 1210705102.

It is not a weakly prime, because it can be changed into another prime (1210705123) 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, 605352560 + 605352561.

It is an arithmetic number, because the mean of its divisors is an integer number (605352561).

Almost surely, 2^1210705121 is an apocalyptic number.

It is an amenable number.

1210705121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210705121 is an equidigital number, since it uses as much as digits as its factorization.

1210705121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 1210705121 is about 34795.1881874491. The cubic root of 1210705121 is about 1065.8091878983.

Adding to 1210705121 its reverse (1215070121), we get a palindrome (2425775242).

The spelling of 1210705121 in words is "one billion, two hundred ten million, seven hundred five thousand, one hundred twenty-one".