12100043221 has 4 divisors (see below), whose sum is σ = 13828620832. Its totient is φ = 10371465612.

The previous prime is 12100043191. The next prime is 12100043227. The reversal of 12100043221 is 12234000121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12234000121 = 7 ⋅1747714303.

It is a cyclic number.

It is not a de Polignac number, because 12100043221 - 2¹⁹ = 12099518933 is a prime.

It is a super-2 number, since 2×12100043221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12100043195 and 12100043204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100043227) 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, 864288795 + ... + 864288808.

It is an arithmetic number, because the mean of its divisors is an integer number (3457155208).

Almost surely, 2^12100043221 is an apocalyptic number.

It is an amenable number.

12100043221 is a deficient number, since it is larger than the sum of its proper divisors (1728577611).

12100043221 is an equidigital number, since it uses as much as digits as its factorization.

12100043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728577610.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 12100043221 its reverse (12234000121), we get a palindrome (24334043342).

The spelling of 12100043221 in words is "twelve billion, one hundred million, forty-three thousand, two hundred twenty-one".