12021000111221 has 4 divisors (see below), whose sum is σ = 12021051239232. Its totient is φ = 12020948983212.

The previous prime is 12021000111199. The next prime is 12021000111233. The reversal of 12021000111221 is 12211100012021.

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 a de Polignac number, because none of the positive numbers 2^k-12021000111221 is a prime.

It is a super-2 number, since 2×12021000111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021000111196 and 12021000111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021000111521) 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, 25209695 + ... + 25682108.

It is an arithmetic number, because the mean of its divisors is an integer number (3005262809808).

Almost surely, 2^{12021000111221} is an apocalyptic number.

It is an amenable number.

12021000111221 is a deficient number, since it is larger than the sum of its proper divisors (51128011).

12021000111221 is an equidigital number, since it uses as much as digits as its factorization.

12021000111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51128010.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12021000111221 its reverse (12211100012021), we get a palindrome (24232100123242).

The spelling of 12021000111221 in words is "twelve trillion, twenty-one billion, one hundred eleven thousand, two hundred twenty-one".