2133221309 has 2 divisors, whose sum is σ = 2133221310. Its totient is φ = 2133221308.

The previous prime is 2133221297. The next prime is 2133221323. The reversal of 2133221309 is 9031223312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1978915225 + 154306084 = 44485^2 + 12422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2133221309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2133221339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1066610654 + 1066610655.

It is an arithmetic number, because the mean of its divisors is an integer number (1066610655).

Almost surely, 2^2133221309 is an apocalyptic number.

It is an amenable number.

2133221309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2133221309 is an equidigital number, since it uses as much as digits as its factorization.

2133221309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 2133221309 is about 46186.8088202682. The cubic root of 2133221309 is about 1287.2966460996.

The spelling of 2133221309 in words is "two billion, one hundred thirty-three million, two hundred twenty-one thousand, three hundred nine".