21113030321 has 4 divisors (see below), whose sum is σ = 21201369600. Its totient is φ = 21024691044.

The previous prime is 21113030249. The next prime is 21113030327. The reversal of 21113030321 is 12303031112.

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 21113030321 - 2¹⁸ = 21112768177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113030321.

It is not an unprimeable number, because it can be changed into a prime (21113030327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44169281 + ... + 44169758.

It is an arithmetic number, because the mean of its divisors is an integer number (5300342400).

Almost surely, 2^21113030321 is an apocalyptic number.

It is an amenable number.

21113030321 is a deficient number, since it is larger than the sum of its proper divisors (88339279).

21113030321 is an equidigital number, since it uses as much as digits as its factorization.

21113030321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88339278.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21113030321 its reverse (12303031112), we get a palindrome (33416061433).

The spelling of 21113030321 in words is "twenty-one billion, one hundred thirteen million, thirty thousand, three hundred twenty-one".