12221001040021 has 2 divisors, whose sum is σ = 12221001040022. Its totient is φ = 12221001040020.

The previous prime is 12221001040013. The next prime is 12221001040097. The reversal of 12221001040021 is 12004010012221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9128942559396 + 3092058480625 = 3021414^2 + 1758425^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221001040021 - 2³ = 12221001040013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221001039977 and 12221001040004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221001040321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110500520010 + 6110500520011.

It is an arithmetic number, because the mean of its divisors is an integer number (6110500520011).

Almost surely, 2^{12221001040021} is an apocalyptic number.

It is an amenable number.

12221001040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221001040021 is an equidigital number, since it uses as much as digits as its factorization.

12221001040021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12221001040021 its reverse (12004010012221), we get a palindrome (24225011052242).

The spelling of 12221001040021 in words is "twelve trillion, two hundred twenty-one billion, one million, forty thousand, twenty-one".