2121123221312 has 14 divisors (see below), whose sum is σ = 4209103892418. Its totient is φ = 1060561610624.

The previous prime is 2121123221297. The next prime is 2121123221323. The reversal of 2121123221312 is 2131223211212.

It can be written as a sum of positive squares in only one way, i.e., 1795557120256 + 325566101056 = 1339984^2 + 570584^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16571275103 + ... + 16571275230.

Almost surely, 2^{2121123221312} is an apocalyptic number.

It is an amenable number.

2121123221312 is a deficient number, since it is larger than the sum of its proper divisors (2087980671106).

2121123221312 is an equidigital number, since it uses as much as digits as its factorization.

2121123221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33142550345 (or 33142550335 counting only the distinct ones).

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

Adding to 2121123221312 its reverse (2131223211212), we get a palindrome (4252346432524).

The spelling of 2121123221312 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred twelve".