21222223355413 has 2 divisors, whose sum is σ = 21222223355414. Its totient is φ = 21222223355412.

The previous prime is 21222223355381. The next prime is 21222223355539. The reversal of 21222223355413 is 31455332222212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18549577114084 + 2672646241329 = 4306922^2 + 1634823^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222223355413 - 2⁵ = 21222223355381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222223352413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611111677706 + 10611111677707.

It is an arithmetic number, because the mean of its divisors is an integer number (10611111677707).

Almost surely, 2^{21222223355413} is an apocalyptic number.

It is an amenable number.

21222223355413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222223355413 is an equidigital number, since it uses as much as digits as its factorization.

21222223355413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 37.

Adding to 21222223355413 its reverse (31455332222212), we get a palindrome (52677555577625).

It can be divided in two parts, 212 and 22223355413, that added together give a square (22223355625 = 149075²).

The spelling of 21222223355413 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-three million, three hundred fifty-five thousand, four hundred thirteen".