21069159109 has 4 divisors (see below), whose sum is σ = 22178062240. Its totient is φ = 19960255980.

The previous prime is 21069159091. The next prime is 21069159113. The reversal of 21069159109 is 90195196012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21069159109 - 2¹³ = 21069150917 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 (21069159119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554451537 + ... + 554451574.

It is an arithmetic number, because the mean of its divisors is an integer number (5544515560).

Almost surely, 2^21069159109 is an apocalyptic number.

It is an amenable number.

21069159109 is a deficient number, since it is larger than the sum of its proper divisors (1108903131).

21069159109 is a wasteful number, since it uses less digits than its factorization.

21069159109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108903130.

The product of its (nonzero) digits is 43740, while the sum is 43.

The spelling of 21069159109 in words is "twenty-one billion, sixty-nine million, one hundred fifty-nine thousand, one hundred nine".