2121032123123 has 4 divisors (see below), whose sum is σ = 2125282689000. Its totient is φ = 2116781557248.

The previous prime is 2121032123117. The next prime is 2121032123131. The reversal of 2121032123123 is 3213212301212.

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 2121032123123 - 2⁴ = 2121032123107 is a prime.

It is a super-2 number, since 2×2121032123123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121032123183) 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, 2125282190 + ... + 2125283187.

It is an arithmetic number, because the mean of its divisors is an integer number (531320672250).

Almost surely, 2^{2121032123123} is an apocalyptic number.

2121032123123 is a deficient number, since it is larger than the sum of its proper divisors (4250565877).

2121032123123 is an equidigital number, since it uses as much as digits as its factorization.

2121032123123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250565876.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 2121032123123 its reverse (3213212301212), we get a palindrome (5334244424335).

The spelling of 2121032123123 in words is "two trillion, one hundred twenty-one billion, thirty-two million, one hundred twenty-three thousand, one hundred twenty-three".