12021020001221 has 16 divisors (see below), whose sum is σ = 14988013383168. Its totient is φ = 9366548780400.

The previous prime is 12021020001187. The next prime is 12021020001377. The reversal of 12021020001221 is 12210002012021.

12021020001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12021020001221 - 2³⁰ = 12019946259397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021020001196 and 12021020001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021020004221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2481515 + ... + 5495448.

It is an arithmetic number, because the mean of its divisors is an integer number (936750836448).

Almost surely, 2^{12021020001221} is an apocalyptic number.

12021020001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12021020001221 is a deficient number, since it is larger than the sum of its proper divisors (2966993381947).

12021020001221 is a wasteful number, since it uses less digits than its factorization.

12021020001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7996552.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12021020001221 its reverse (12210002012021), we get a palindrome (24231022013242).

The spelling of 12021020001221 in words is "twelve trillion, twenty-one billion, twenty million, one thousand, two hundred twenty-one".