21300122309 has 4 divisors (see below), whose sum is σ = 21443076300. Its totient is φ = 21157168320.

The previous prime is 21300122293. The next prime is 21300122323. The reversal of 21300122309 is 90322100312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4283702500 + 17016419809 = 65450^2 + 130447^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300122309 - 2⁴ = 21300122293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300125309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71476772 + ... + 71477069.

It is an arithmetic number, because the mean of its divisors is an integer number (5360769075).

Almost surely, 2^21300122309 is an apocalyptic number.

It is an amenable number.

21300122309 is a deficient number, since it is larger than the sum of its proper divisors (142953991).

21300122309 is a wasteful number, since it uses less digits than its factorization.

21300122309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142953990.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21300122309 in words is "twenty-one billion, three hundred million, one hundred twenty-two thousand, three hundred nine".