12112202111621 has 2 divisors, whose sum is σ = 12112202111622. Its totient is φ = 12112202111620.

The previous prime is 12112202111617. The next prime is 12112202111627. The reversal of 12112202111621 is 12611120221121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11397477280225 + 714724831396 = 3376015^2 + 845414^2 .

It is a cyclic number.

It is not a de Polignac number, because 12112202111621 - 2² = 12112202111617 is a prime.

It is a super-2 number, since 2×12112202111621² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12112202111627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6056101055810 + 6056101055811.

It is an arithmetic number, because the mean of its divisors is an integer number (6056101055811).

Almost surely, 2^{12112202111621} is an apocalyptic number.

It is an amenable number.

12112202111621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12112202111621 is an equidigital number, since it uses as much as digits as its factorization.

12112202111621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 23.

Adding to 12112202111621 its reverse (12611120221121), we get a palindrome (24723322332742).

The spelling of 12112202111621 in words is "twelve trillion, one hundred twelve billion, two hundred two million, one hundred eleven thousand, six hundred twenty-one".