2133121021 has 2 divisors, whose sum is σ = 2133121022. Its totient is φ = 2133121020.

The previous prime is 2133120973. The next prime is 2133121027. The reversal of 2133121021 is 1201213312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1543311225 + 589809796 = 39285^2 + 24286^2 .

It is a cyclic number.

It is not a de Polignac number, because 2133121021 - 2¹¹ = 2133118973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2133120986 and 2133121004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2133121027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1066560510 + 1066560511.

It is an arithmetic number, because the mean of its divisors is an integer number (1066560511).

Almost surely, 2^2133121021 is an apocalyptic number.

It is an amenable number.

2133121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2133121021 is an equidigital number, since it uses as much as digits as its factorization.

2133121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2133121021 is about 46185.7231295560. The cubic root of 2133121021 is about 1287.2764727857.

Adding to 2133121021 its reverse (1201213312), we get a palindrome (3334334333).

The spelling of 2133121021 in words is "two billion, one hundred thirty-three million, one hundred twenty-one thousand, twenty-one".