12001210221 has 64 divisors (see below), whose sum is σ = 22065555456. Its totient is φ = 5599238400.

The previous prime is 12001210189. The next prime is 12001210223. The reversal of 12001210221 is 12201210021.

It is not a de Polignac number, because 12001210221 - 2⁵ = 12001210189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001210197 and 12001210206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001210223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 57106 + ... + 165116.

It is an arithmetic number, because the mean of its divisors is an integer number (344774304).

Almost surely, 2^12001210221 is an apocalyptic number.

12001210221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12001210221 is a deficient number, since it is larger than the sum of its proper divisors (10064345235).

12001210221 is a wasteful number, since it uses less digits than its factorization.

12001210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108082.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12001210221 its reverse (12201210021), we get a palindrome (24202420242).

It can be divided in two parts, 12001 and 210221, that added together give a palindrome (222222).

The spelling of 12001210221 in words is "twelve billion, one million, two hundred ten thousand, two hundred twenty-one".