12021222001 has 4 divisors (see below), whose sum is σ = 12097790452. Its totient is φ = 11944653552.

The previous prime is 12021221999. The next prime is 12021222023. The reversal of 12021222001 is 10022212021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10022212021 = 10259 ⋅976919.

It can be written as a sum of positive squares in 2 ways, for example, as 1971360000 + 10049862001 = 44400^2 + 100249^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021222001 - 2¹ = 12021221999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021222701) 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, 38283990 + ... + 38284303.

It is an arithmetic number, because the mean of its divisors is an integer number (3024447613).

Almost surely, 2^12021222001 is an apocalyptic number.

It is an amenable number.

12021222001 is a deficient number, since it is larger than the sum of its proper divisors (76568451).

12021222001 is an equidigital number, since it uses as much as digits as its factorization.

12021222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76568450.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12021222001 its reverse (10022212021), we get a palindrome (22043434022).

The spelling of 12021222001 in words is "twelve billion, twenty-one million, two hundred twenty-two thousand, one".