12112211220021 has 24 divisors (see below), whose sum is σ = 19101337972704. Its totient is φ = 7334799694560.

The previous prime is 12112211220001. The next prime is 12112211220023. The reversal of 12112211220021 is 12002211221121.

12112211220021 is a `hidden beast` number, since 1 + 211 + 2 + 211 + 220 + 0 + 21 = 666.

It is not a de Polignac number, because 12112211220021 - 2¹³ = 12112211211829 is a prime.

It is a super-3 number, since 3×12112211220021³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12112211219976 and 12112211220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112211220023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49330071 + ... + 49574996.

It is an arithmetic number, because the mean of its divisors is an integer number (795889082196).

Almost surely, 2^{12112211220021} is an apocalyptic number.

12112211220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12112211220021 is a deficient number, since it is larger than the sum of its proper divisors (6989126752683).

12112211220021 is a wasteful number, since it uses less digits than its factorization.

12112211220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98906321 (or 98906318 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12112211220021 its reverse (12002211221121), we get a palindrome (24114422441142).

The spelling of 12112211220021 in words is "twelve trillion, one hundred twelve billion, two hundred eleven million, two hundred twenty thousand, twenty-one".