12055111421 has 2 divisors, whose sum is σ = 12055111422. Its totient is φ = 12055111420.

The previous prime is 12055111379. The next prime is 12055111427. The reversal of 12055111421 is 12411155021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9031651225 + 3023460196 = 95035^2 + 54986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12055111421 is a prime.

It is a super-2 number, since 2×12055111421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12055111427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6027555710 + 6027555711.

It is an arithmetic number, because the mean of its divisors is an integer number (6027555711).

Almost surely, 2^12055111421 is an apocalyptic number.

It is an amenable number.

12055111421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12055111421 is an equidigital number, since it uses as much as digits as its factorization.

12055111421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 12055111421 its reverse (12411155021), we get a palindrome (24466266442).

The spelling of 12055111421 in words is "twelve billion, fifty-five million, one hundred eleven thousand, four hundred twenty-one".