21000033289 has 2 divisors, whose sum is σ = 21000033290. Its totient is φ = 21000033288.

The previous prime is 21000033283. The next prime is 21000033389. The reversal of 21000033289 is 98233000012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18094823289 + 2905210000 = 134517^2 + 53900^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000033289 - 2¹⁹ = 20999509001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000033283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500016644 + 10500016645.

It is an arithmetic number, because the mean of its divisors is an integer number (10500016645).

Almost surely, 2^21000033289 is an apocalyptic number.

It is an amenable number.

21000033289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000033289 is an equidigital number, since it uses as much as digits as its factorization.

21000033289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21000033289 in words is "twenty-one billion, thirty-three thousand, two hundred eighty-nine".