12001000020221 has 4 divisors (see below), whose sum is σ = 12124721670012. Its totient is φ = 11877278370432.

The previous prime is 12001000020211. The next prime is 12001000020277. The reversal of 12001000020221 is 12202000010021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1926793848100 + 10074206172121 = 1388090^2 + 3173989^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001000020221 - 2⁶ = 12001000020157 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 (12001000020211) 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, 61860824750 + ... + 61860824943.

It is an arithmetic number, because the mean of its divisors is an integer number (3031180417503).

Almost surely, 2^{12001000020221} is an apocalyptic number.

It is an amenable number.

12001000020221 is a deficient number, since it is larger than the sum of its proper divisors (123721649791).

12001000020221 is an equidigital number, since it uses as much as digits as its factorization.

12001000020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123721649790.

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

Adding to 12001000020221 its reverse (12202000010021), we get a palindrome (24203000030242).

The spelling of 12001000020221 in words is "twelve trillion, one billion, twenty thousand, two hundred twenty-one".