2121355433 has 2 divisors, whose sum is σ = 2121355434. Its totient is φ = 2121355432.

The previous prime is 2121355427. The next prime is 2121355477. The reversal of 2121355433 is 3345531212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1710401449 + 410953984 = 41357^2 + 20272^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121355433 - 2¹⁴ = 2121339049 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2121355396 and 2121355405.

It is not a weakly prime, because it can be changed into another prime (2121355333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060677716 + 1060677717.

It is an arithmetic number, because the mean of its divisors is an integer number (1060677717).

Almost surely, 2^2121355433 is an apocalyptic number.

It is an amenable number.

2121355433 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121355433 is an equidigital number, since it uses as much as digits as its factorization.

2121355433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 29.

The square root of 2121355433 is about 46058.1744427631. The cubic root of 2121355433 is about 1284.9053780246.

Adding to 2121355433 its reverse (3345531212), we get a palindrome (5466886645).

The spelling of 2121355433 in words is "two billion, one hundred twenty-one million, three hundred fifty-five thousand, four hundred thirty-three".