12021210001 has 4 divisors (see below), whose sum is σ = 12021541092. Its totient is φ = 12020878912.

The previous prime is 12021209971. The next prime is 12021210011. The reversal of 12021210001 is 10001212021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10001212021 = 41411 ⋅241511.

It can be written as a sum of positive squares in 2 ways, for example, as 6515718400 + 5505491601 = 80720^2 + 74199^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021210001 - 2¹³ = 12021201809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021210001.

It is not an unprimeable number, because it can be changed into a prime (12021210011) 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, 103276 + ... + 186301.

It is an arithmetic number, because the mean of its divisors is an integer number (3005385273).

Almost surely, 2^12021210001 is an apocalyptic number.

It is an amenable number.

12021210001 is a deficient number, since it is larger than the sum of its proper divisors (331091).

12021210001 is an equidigital number, since it uses as much as digits as its factorization.

12021210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331090.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12021210001 its reverse (10001212021), we get a palindrome (22022422022).

The spelling of 12021210001 in words is "twelve billion, twenty-one million, two hundred ten thousand, one".