21110013331321 has 4 divisors (see below), whose sum is σ = 21110028007312. Its totient is φ = 21109998655332.

The previous prime is 21110013331301. The next prime is 21110013331333. The reversal of 21110013331321 is 12313331001112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21110013331321 - 2⁷ = 21110013331193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110013331292 and 21110013331301.

It is not an unprimeable number, because it can be changed into a prime (21110013331301) 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, 4913331 + ... + 8146216.

It is an arithmetic number, because the mean of its divisors is an integer number (5277507001828).

Almost surely, 2^{21110013331321} is an apocalyptic number.

It is an amenable number.

21110013331321 is a deficient number, since it is larger than the sum of its proper divisors (14675991).

21110013331321 is a wasteful number, since it uses less digits than its factorization.

21110013331321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14675990.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 21110013331321 its reverse (12313331001112), we get a palindrome (33423344332433).

The spelling of 21110013331321 in words is "twenty-one trillion, one hundred ten billion, thirteen million, three hundred thirty-one thousand, three hundred twenty-one".