2121001123 has 4 divisors (see below), whose sum is σ = 2124363088. Its totient is φ = 2117639160.

The previous prime is 2121001087. The next prime is 2121001163. The reversal of 2121001123 is 3211001212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121001123 is a prime.

It is a super-4 number, since 4×2121001123⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121001163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1680036 + ... + 1681297.

It is an arithmetic number, because the mean of its divisors is an integer number (531090772).

Almost surely, 2^2121001123 is an apocalyptic number.

2121001123 is a deficient number, since it is larger than the sum of its proper divisors (3361965).

2121001123 is an equidigital number, since it uses as much as digits as its factorization.

2121001123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361964.

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

The square root of 2121001123 is about 46054.3279508018. The cubic root of 2121001123 is about 1284.8338388307.

Adding to 2121001123 its reverse (3211001212), we get a palindrome (5332002335).

The spelling of 2121001123 in words is "two billion, one hundred twenty-one million, one thousand, one hundred twenty-three".