21266324433321 has 64 divisors (see below), whose sum is σ = 33096766980096. Its totient is φ = 12025332475200.

The previous prime is 21266324433313. The next prime is 21266324433329. The reversal of 21266324433321 is 12333442366212.

It is an interprime number because it is at equal distance from previous prime (21266324433313) and next prime (21266324433329).

It is not a de Polignac number, because 21266324433321 - 2³ = 21266324433313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21266324433329) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 79335 + ... + 6522188.

It is an arithmetic number, because the mean of its divisors is an integer number (517136984064).

Almost surely, 2^{21266324433321} is an apocalyptic number.

It is an amenable number.

21266324433321 is a deficient number, since it is larger than the sum of its proper divisors (11830442546775).

21266324433321 is a wasteful number, since it uses less digits than its factorization.

21266324433321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6601682.

The product of its digits is 746496, while the sum is 42.

Adding to 21266324433321 its reverse (12333442366212), we get a palindrome (33599766799533).

The spelling of 21266324433321 in words is "twenty-one trillion, two hundred sixty-six billion, three hundred twenty-four million, four hundred thirty-three thousand, three hundred twenty-one".