1210120121 has 8 divisors (see below), whose sum is σ = 1411219200. Its totient is φ = 1037245524.

The previous prime is 1210120103. The next prime is 1210120189. The reversal of 1210120121 is 1210210121.

It is not a de Polignac number, because 1210120121 - 2⁶ = 1210120057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210120721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1763681 + ... + 1764366.

It is an arithmetic number, because the mean of its divisors is an integer number (176402400).

Almost surely, 2^1210120121 is an apocalyptic number.

It is an amenable number.

1210120121 is a deficient number, since it is larger than the sum of its proper divisors (201099079).

1210120121 is an frugal number, since it uses more digits than its factorization.

1210120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3528068 (or 3528054 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1210120121 is about 34786.7808369789. The cubic root of 1210120121 is about 1065.6374976401.

Adding to 1210120121 its reverse (1210210121), we get a palindrome (2420330242).

Subtracting 1210120121 from its reverse (1210210121), we obtain a square (90000 = 300²).

The spelling of 1210120121 in words is "one billion, two hundred ten million, one hundred twenty thousand, one hundred twenty-one".