12021011221 has 8 divisors (see below), whose sum is σ = 12219482880. Its totient is φ = 11823697392.

The previous prime is 12021011153. The next prime is 12021011231. The reversal of 12021011221 is 12211012021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021011221 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 (12021011231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268510 + ... + 310063.

It is an arithmetic number, because the mean of its divisors is an integer number (1527435360).

Almost surely, 2^12021011221 is an apocalyptic number.

It is an amenable number.

12021011221 is a deficient number, since it is larger than the sum of its proper divisors (198471659).

12021011221 is an equidigital number, since it uses as much as digits as its factorization.

12021011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578915.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12021011221 its reverse (12211012021), we get a palindrome (24232023242).

The spelling of 12021011221 in words is "twelve billion, twenty-one million, eleven thousand, two hundred twenty-one".