12020111111221 has 4 divisors (see below), whose sum is σ = 12020173308844. Its totient is φ = 12020048913600.

The previous prime is 12020111111209. The next prime is 12020111111291. The reversal of 12020111111221 is 12211111102021.

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 3997400422500 + 8022710688721 = 1999350^2 + 2832439^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020111111221 - 2⁷ = 12020111111093 is a prime.

It is a super-2 number, since 2×12020111111221² (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 = 12020111111195 and 12020111111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020111111291) 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, 30808020 + ... + 31195741.

It is an arithmetic number, because the mean of its divisors is an integer number (3005043327211).

Almost surely, 2^{12020111111221} is an apocalyptic number.

It is an amenable number.

12020111111221 is a deficient number, since it is larger than the sum of its proper divisors (62197623).

12020111111221 is an equidigital number, since it uses as much as digits as its factorization.

12020111111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62197622.

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

Adding to 12020111111221 its reverse (12211111102021), we get a palindrome (24231222213242).

The spelling of 12020111111221 in words is "twelve trillion, twenty billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".