2112121001 has 4 divisors (see below), whose sum is σ = 2121186132. Its totient is φ = 2103055872.

The previous prime is 2112120979. The next prime is 2112121007. The reversal of 2112121001 is 1001212112.

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 1465741225 + 646379776 = 38285^2 + 25424^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112121001 - 2⁶ = 2112120937 is a prime.

It is a super-2 number, since 2×2112121001² = 8922110245730484002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2112121007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4532216 + ... + 4532681.

It is an arithmetic number, because the mean of its divisors is an integer number (530296533).

Almost surely, 2^2112121001 is an apocalyptic number.

It is an amenable number.

2112121001 is a deficient number, since it is larger than the sum of its proper divisors (9065131).

2112121001 is an equidigital number, since it uses as much as digits as its factorization.

2112121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9065130.

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

The square root of 2112121001 is about 45957.8176266019. The cubic root of 2112121001 is about 1283.0382337313.

Adding to 2112121001 its reverse (1001212112), we get a palindrome (3113333113).

It can be divided in two parts, 211 and 2121001, that added together give a palindrome (2121212).

The spelling of 2112121001 in words is "two billion, one hundred twelve million, one hundred twenty-one thousand, one".