21163326100321 has 4 divisors (see below), whose sum is σ = 22408227635652. Its totient is φ = 19918424564992.

The previous prime is 21163326100307. The next prime is 21163326100363. The reversal of 21163326100321 is 12300162336112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19084351422096 + 2078974678225 = 4368564^2 + 1441865^2 .

It is a cyclic number.

It is not a de Polignac number, because 21163326100321 - 2¹⁹ = 21163325576033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21163326100381) 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 in 3 ways as a sum of consecutive naturals, for example, 622450767640 + ... + 622450767673.

It is an arithmetic number, because the mean of its divisors is an integer number (5602056908913).

Almost surely, 2^{21163326100321} is an apocalyptic number.

It is an amenable number.

21163326100321 is a deficient number, since it is larger than the sum of its proper divisors (1244901535331).

21163326100321 is a wasteful number, since it uses less digits than its factorization.

21163326100321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244901535330.

The product of its (nonzero) digits is 7776, while the sum is 31.

Adding to 21163326100321 its reverse (12300162336112), we get a palindrome (33463488436433).

The spelling of 21163326100321 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred twenty-six million, one hundred thousand, three hundred twenty-one".