21213364663415 has 16 divisors (see below), whose sum is σ = 25698028973760. Its totient is φ = 16809466567680.

The previous prime is 21213364663397. The next prime is 21213364663423. The reversal of 21213364663415 is 51436646331212.

It is a happy number.

It is not a de Polignac number, because 21213364663415 - 2¹⁶ = 21213364597879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21213364663415.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 4742459 + ... + 8057148.

It is an arithmetic number, because the mean of its divisors is an integer number (1606126810860).

Almost surely, 2^{21213364663415} is an apocalyptic number.

21213364663415 is a deficient number, since it is larger than the sum of its proper divisors (4484664310345).

21213364663415 is a wasteful number, since it uses less digits than its factorization.

21213364663415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12802762.

The product of its digits is 1866240, while the sum is 47.

The spelling of 21213364663415 in words is "twenty-one trillion, two hundred thirteen billion, three hundred sixty-four million, six hundred sixty-three thousand, four hundred fifteen".