21213402130441 has 2 divisors, whose sum is σ = 21213402130442. Its totient is φ = 21213402130440.

The previous prime is 21213402130391. The next prime is 21213402130477. The reversal of 21213402130441 is 14403120431212.

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., 17449041612025 + 3764360518416 = 4177205^2 + 1940196^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213402130441 - 2¹⁹ = 21213401606153 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213402130541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606701065220 + 10606701065221.

It is an arithmetic number, because the mean of its divisors is an integer number (10606701065221).

Almost surely, 2^{21213402130441} is an apocalyptic number.

It is an amenable number.

21213402130441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213402130441 is an equidigital number, since it uses as much as digits as its factorization.

21213402130441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21213402130441 its reverse (14403120431212), we get a palindrome (35616522561653).

The spelling of 21213402130441 in words is "twenty-one trillion, two hundred thirteen billion, four hundred two million, one hundred thirty thousand, four hundred forty-one".