2121123223121 has 8 divisors (see below), whose sum is σ = 2475718291200. Its totient is φ = 1779422521248.

The previous prime is 2121123223111. The next prime is 2121123223133. The reversal of 2121123223121 is 1213223211212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121123223121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121123223111) 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, 3223591196 + ... + 3223591853.

It is an arithmetic number, because the mean of its divisors is an integer number (309464786400).

Almost surely, 2^{2121123223121} is an apocalyptic number.

It is an amenable number.

2121123223121 is a deficient number, since it is larger than the sum of its proper divisors (354595068079).

2121123223121 is an equidigital number, since it uses as much as digits as its factorization.

2121123223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6447183103.

The product of its digits is 576, while the sum is 23.

Adding to 2121123223121 its reverse (1213223211212), we get a palindrome (3334346434333).

The spelling of 2121123223121 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred twenty-three thousand, one hundred twenty-one".