12001012221 has 8 divisors (see below), whose sum is σ = 17456017824. Its totient is φ = 7273340720.

The previous prime is 12001012207. The next prime is 12001012241. The reversal of 12001012221 is 12221010021.

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 12001012221 - 2¹⁵ = 12000979453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001012197 and 12001012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001012241) 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, 181833486 + ... + 181833551.

It is an arithmetic number, because the mean of its divisors is an integer number (2182002228).

Almost surely, 2^12001012221 is an apocalyptic number.

12001012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12001012221 is a deficient number, since it is larger than the sum of its proper divisors (5455005603).

12001012221 is a wasteful number, since it uses less digits than its factorization.

12001012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363667051.

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

Adding to 12001012221 its reverse (12221010021), we get a palindrome (24222022242).

It can be divided in two parts, 120010 and 12221, that added together give a palindrome (132231).

The spelling of 12001012221 in words is "twelve billion, one million, twelve thousand, two hundred twenty-one".