1230120121 has 4 divisors (see below), whose sum is σ = 1230745572. Its totient is φ = 1229494672.

The previous prime is 1230120113. The next prime is 1230120131. The reversal of 1230120121 is 1210210321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 291555625 + 938564496 = 17075^2 + 30636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230120121 - 2³ = 1230120113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1230120131) 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 in 3 ways as a sum of consecutive naturals, for example, 309766 + ... + 313711.

It is an arithmetic number, because the mean of its divisors is an integer number (307686393).

Almost surely, 2^1230120121 is an apocalyptic number.

It is an amenable number.

1230120121 is a deficient number, since it is larger than the sum of its proper divisors (625451).

1230120121 is an equidigital number, since it uses as much as digits as its factorization.

1230120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625450.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1230120121 is about 35073.0683145915. The cubic root of 1230120121 is about 1071.4761473079.

Adding to 1230120121 its reverse (1210210321), we get a palindrome (2440330442).

The spelling of 1230120121 in words is "one billion, two hundred thirty million, one hundred twenty thousand, one hundred twenty-one".