2121221333333 has 4 divisors (see below), whose sum is σ = 2124008747148. Its totient is φ = 2118433919520.

The previous prime is 2121221333327. The next prime is 2121221333377. The reversal of 2121221333333 is 3333331221212.

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 8753847844 + 2112467485489 = 93562^2 + 1453433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121221333333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121221333296 and 2121221333305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221333383) 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, 1393705766 + ... + 1393707287.

It is an arithmetic number, because the mean of its divisors is an integer number (531002186787).

Almost surely, 2^{2121221333333} is an apocalyptic number.

It is an amenable number.

2121221333333 is a deficient number, since it is larger than the sum of its proper divisors (2787413815).

2121221333333 is an equidigital number, since it uses as much as digits as its factorization.

2121221333333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787413814.

The product of its digits is 11664, while the sum is 29.

Adding to 2121221333333 its reverse (3333331221212), we get a palindrome (5454552554545).

The spelling of 2121221333333 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, three hundred thirty-three thousand, three hundred thirty-three".