21424004043413 has 2 divisors, whose sum is σ = 21424004043414. Its totient is φ = 21424004043412.

The previous prime is 21424004043397. The next prime is 21424004043461. The reversal of 21424004043413 is 31434040042412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20899910576164 + 524093467249 = 4571642^2 + 723943^2 .

It is a cyclic number.

It is not a de Polignac number, because 21424004043413 - 2⁴ = 21424004043397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21424004043413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21424004043613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712002021706 + 10712002021707.

It is an arithmetic number, because the mean of its divisors is an integer number (10712002021707).

Almost surely, 2^{21424004043413} is an apocalyptic number.

It is an amenable number.

21424004043413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424004043413 is an equidigital number, since it uses as much as digits as its factorization.

21424004043413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 21424004043413 its reverse (31434040042412), we get a palindrome (52858044085825).

The spelling of 21424004043413 in words is "twenty-one trillion, four hundred twenty-four billion, four million, forty-three thousand, four hundred thirteen".