12021230021221 has 4 divisors (see below), whose sum is σ = 12021855527200. Its totient is φ = 12020604515244.

The previous prime is 12021230021201. The next prime is 12021230021327. The reversal of 12021230021221 is 12212003212021.

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.

It is a cyclic number.

It is not a de Polignac number, because 12021230021221 - 2¹¹ = 12021230019173 is a prime.

It is a super-2 number, since 2×12021230021221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021230021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312724161 + ... + 312762598.

It is an arithmetic number, because the mean of its divisors is an integer number (3005463881800).

Almost surely, 2^{12021230021221} is an apocalyptic number.

It is an amenable number.

12021230021221 is a deficient number, since it is larger than the sum of its proper divisors (625505979).

12021230021221 is an equidigital number, since it uses as much as digits as its factorization.

12021230021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625505978.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 12021230021221 its reverse (12212003212021), we get a palindrome (24233233233242).

The spelling of 12021230021221 in words is "twelve trillion, twenty-one billion, two hundred thirty million, twenty-one thousand, two hundred twenty-one".