21021300213317 has 2 divisors, whose sum is σ = 21021300213318. Its totient is φ = 21021300213316.

The previous prime is 21021300213301. The next prime is 21021300213323. The reversal of 21021300213317 is 71331200312012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15843313493956 + 5177986719361 = 3980366^2 + 2275519^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021300213317 - 2⁴ = 21021300213301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021300213337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510650106658 + 10510650106659.

It is an arithmetic number, because the mean of its divisors is an integer number (10510650106659).

Almost surely, 2^{21021300213317} is an apocalyptic number.

It is an amenable number.

21021300213317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021300213317 is an equidigital number, since it uses as much as digits as its factorization.

21021300213317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 21021300213317 its reverse (71331200312012), we get a palindrome (92352500525329).

The spelling of 21021300213317 in words is "twenty-one trillion, twenty-one billion, three hundred million, two hundred thirteen thousand, three hundred seventeen".