21230133109 has 4 divisors (see below), whose sum is σ = 21578168140. Its totient is φ = 20882098080.

The previous prime is 21230133101. The next prime is 21230133163. The reversal of 21230133109 is 90133103212.

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 7934890084 + 13295243025 = 89078^2 + 115305^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230133109 - 2³ = 21230133101 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 (21230133101) 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, 174017424 + ... + 174017545.

It is an arithmetic number, because the mean of its divisors is an integer number (5394542035).

Almost surely, 2^21230133109 is an apocalyptic number.

It is an amenable number.

21230133109 is a deficient number, since it is larger than the sum of its proper divisors (348035031).

21230133109 is an equidigital number, since it uses as much as digits as its factorization.

21230133109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348035030.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 21230133109 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-three thousand, one hundred nine".