21200313109 has 2 divisors, whose sum is σ = 21200313110. Its totient is φ = 21200313108.

The previous prime is 21200313067. The next prime is 21200313179. The reversal of 21200313109 is 90131300212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12154401009 + 9045912100 = 110247^2 + 95110^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200313109 - 2¹⁷ = 21200182037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21200313109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200313179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600156554 + 10600156555.

It is an arithmetic number, because the mean of its divisors is an integer number (10600156555).

Almost surely, 2^21200313109 is an apocalyptic number.

It is an amenable number.

21200313109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200313109 is an equidigital number, since it uses as much as digits as its factorization.

21200313109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 21200313109 in words is "twenty-one billion, two hundred million, three hundred thirteen thousand, one hundred nine".