12123211021 has 8 divisors (see below), whose sum is σ = 12295857024. Its totient is φ = 11950617840.

The previous prime is 12123211007. The next prime is 12123211033. The reversal of 12123211021 is 12011232121.

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 12123211021 - 2¹¹ = 12123208973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12123210986 and 12123211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123211081) 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, 811011 + ... + 825823.

It is an arithmetic number, because the mean of its divisors is an integer number (1536982128).

Almost surely, 2^12123211021 is an apocalyptic number.

It is an amenable number.

12123211021 is a deficient number, since it is larger than the sum of its proper divisors (172646003).

12123211021 is a wasteful number, since it uses less digits than its factorization.

12123211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26411.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12123211021 its reverse (12011232121), we get a palindrome (24134443142).

The spelling of 12123211021 in words is "twelve billion, one hundred twenty-three million, two hundred eleven thousand, twenty-one".