21069345009 has 16 divisors (see below), whose sum is σ = 28859656320. Its totient is φ = 13662840960.

The previous prime is 21069345007. The next prime is 21069345041. The reversal of 21069345009 is 90054396012.

It is not a de Polignac number, because 21069345009 - 2¹ = 21069345007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21069345007) 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 in 15 ways as a sum of consecutive naturals, for example, 411964 + ... + 460274.

It is an arithmetic number, because the mean of its divisors is an integer number (1803728520).

Almost surely, 2^21069345009 is an apocalyptic number.

It is an amenable number.

21069345009 is a deficient number, since it is larger than the sum of its proper divisors (7790311311).

21069345009 is a wasteful number, since it uses less digits than its factorization.

21069345009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52280.

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 21069345009 in words is "twenty-one billion, sixty-nine million, three hundred forty-five thousand, nine".