12021220001 has 4 divisors (see below), whose sum is σ = 13738537152. Its totient is φ = 10303902852.

The previous prime is 12021219929. The next prime is 12021220019. The reversal of 12021220001 is 10002212021.

It is a happy number.

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: 10002212021 = 17 ⋅588365413.

It is a cyclic number.

It is not a de Polignac number, because 12021220001 - 2¹⁰ = 12021218977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12020220001) 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 3 ways as a sum of consecutive naturals, for example, 858658565 + ... + 858658578.

It is an arithmetic number, because the mean of its divisors is an integer number (3434634288).

Almost surely, 2^12021220001 is an apocalyptic number.

It is an amenable number.

12021220001 is a deficient number, since it is larger than the sum of its proper divisors (1717317151).

12021220001 is an equidigital number, since it uses as much as digits as its factorization.

12021220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717317150.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12021220001 its reverse (10002212021), we get a palindrome (22023432022).

The spelling of 12021220001 in words is "twelve billion, twenty-one million, two hundred twenty thousand, one".