20123211109 has 8 divisors (see below), whose sum is σ = 20147726360. Its totient is φ = 20098713600.

The previous prime is 20123211103. The next prime is 20123211181. The reversal of 20123211109 is 90111232102.

It can be written as a sum of positive squares in 4 ways, for example, as 207792225 + 19915418884 = 14415^2 + 141122^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20123211109 - 2⁵ = 20123211077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20123211109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123211103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5002519 + ... + 5006539.

It is an arithmetic number, because the mean of its divisors is an integer number (2518465795).

Almost surely, 2^20123211109 is an apocalyptic number.

It is an amenable number.

20123211109 is a deficient number, since it is larger than the sum of its proper divisors (24515251).

20123211109 is a wasteful number, since it uses less digits than its factorization.

20123211109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8871.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 20123211109 in words is "twenty billion, one hundred twenty-three million, two hundred eleven thousand, one hundred nine".