21112652107009 has 4 divisors (see below), whose sum is σ = 22354572819204. Its totient is φ = 19870731394816.

The previous prime is 21112652107007. The next prime is 21112652107067. The reversal of 21112652107009 is 90070125621112.

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 9317054188225 + 11795597918784 = 3052385^2 + 3434472^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112652107009 - 2¹ = 21112652107007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112652107007) 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, 620960356072 + ... + 620960356105.

It is an arithmetic number, because the mean of its divisors is an integer number (5588643204801).

Almost surely, 2^{21112652107009} is an apocalyptic number.

It is an amenable number.

21112652107009 is a deficient number, since it is larger than the sum of its proper divisors (1241920712195).

21112652107009 is a wasteful number, since it uses less digits than its factorization.

21112652107009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241920712194.

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 21112652107009 in words is "twenty-one trillion, one hundred twelve billion, six hundred fifty-two million, one hundred seven thousand, nine".