2121033112321 has 4 divisors (see below), whose sum is σ = 2121115371012. Its totient is φ = 2120950853632.

The previous prime is 2121033112301. The next prime is 2121033112337. The reversal of 2121033112321 is 1232113301212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 937149844225 + 1183883268096 = 968065^2 + 1088064^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121033112321 - 2¹³ = 2121033104129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121033112292 and 2121033112301.

It is not an unprimeable number, because it can be changed into a prime (2121033112301) 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, 41090656 + ... + 41142241.

It is an arithmetic number, because the mean of its divisors is an integer number (530278842753).

Almost surely, 2^{2121033112321} is an apocalyptic number.

It is an amenable number.

2121033112321 is a deficient number, since it is larger than the sum of its proper divisors (82258691).

2121033112321 is an equidigital number, since it uses as much as digits as its factorization.

2121033112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82258690.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 2121033112321 its reverse (1232113301212), we get a palindrome (3353146413533).

The spelling of 2121033112321 in words is "two trillion, one hundred twenty-one billion, thirty-three million, one hundred twelve thousand, three hundred twenty-one".