2121003344123 has 4 divisors (see below), whose sum is σ = 2213220880848. Its totient is φ = 2028785807400.

The previous prime is 2121003344111. The next prime is 2121003344137. The reversal of 2121003344123 is 3214433001212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121003344123 - 2⁸ = 2121003343867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121003344092 and 2121003344101.

It is not an unprimeable number, because it can be changed into a prime (2121003344143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46108768328 + ... + 46108768373.

It is an arithmetic number, because the mean of its divisors is an integer number (553305220212).

Almost surely, 2^{2121003344123} is an apocalyptic number.

2121003344123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2121003344123 is a deficient number, since it is larger than the sum of its proper divisors (92217536725).

2121003344123 is an equidigital number, since it uses as much as digits as its factorization.

2121003344123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92217536724.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 2121003344123 its reverse (3214433001212), we get a palindrome (5335436345335).

The spelling of 2121003344123 in words is "two trillion, one hundred twenty-one billion, three million, three hundred forty-four thousand, one hundred twenty-three".