21302033309 has 2 divisors, whose sum is σ = 21302033310. Its totient is φ = 21302033308.

The previous prime is 21302033189. The next prime is 21302033351. The reversal of 21302033309 is 90333020312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13846228900 + 7455804409 = 117670^2 + 86347^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302033309 - 2¹² = 21302029213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21302033359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651016654 + 10651016655.

It is an arithmetic number, because the mean of its divisors is an integer number (10651016655).

Almost surely, 2^21302033309 is an apocalyptic number.

It is an amenable number.

21302033309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302033309 is an equidigital number, since it uses as much as digits as its factorization.

21302033309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 26.

The spelling of 21302033309 in words is "twenty-one billion, three hundred two million, thirty-three thousand, three hundred nine".