12051404221 has 2 divisors, whose sum is σ = 12051404222. Its totient is φ = 12051404220.

The previous prime is 12051404213. The next prime is 12051404333. The reversal of 12051404221 is 12240415021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11318619321 + 732784900 = 106389^2 + 27070^2 .

It is a cyclic number.

It is not a de Polignac number, because 12051404221 - 2³ = 12051404213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12051404192 and 12051404201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12051404201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6025702110 + 6025702111.

It is an arithmetic number, because the mean of its divisors is an integer number (6025702111).

Almost surely, 2^12051404221 is an apocalyptic number.

It is an amenable number.

12051404221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12051404221 is an equidigital number, since it uses as much as digits as its factorization.

12051404221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 12051404221 its reverse (12240415021), we get a palindrome (24291819242).

The spelling of 12051404221 in words is "twelve billion, fifty-one million, four hundred four thousand, two hundred twenty-one".