21213556324463 has 2 divisors, whose sum is σ = 21213556324464. Its totient is φ = 21213556324462.

The previous prime is 21213556324423. The next prime is 21213556324547. The reversal of 21213556324463 is 36442365531212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213556324463 - 2⁴⁰ = 20114044696687 is a prime.

It is a super-2 number, since 2×21213556324463² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213556324423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606778162231 + 10606778162232.

It is an arithmetic number, because the mean of its divisors is an integer number (10606778162232).

Almost surely, 2^{21213556324463} is an apocalyptic number.

21213556324463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213556324463 is an equidigital number, since it uses as much as digits as its factorization.

21213556324463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3110400, while the sum is 47.

The spelling of 21213556324463 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-six million, three hundred twenty-four thousand, four hundred sixty-three".