21113000221 has 2 divisors, whose sum is σ = 21113000222. Its totient is φ = 21113000220.

The previous prime is 21113000201. The next prime is 21113000243. The reversal of 21113000221 is 12200031112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12964327321 + 8148672900 = 113861^2 + 90270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113000221 - 2²⁹ = 20576129309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113000201) 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 as a sum of consecutive naturals, namely, 10556500110 + 10556500111.

It is an arithmetic number, because the mean of its divisors is an integer number (10556500111).

Almost surely, 2^21113000221 is an apocalyptic number.

It is an amenable number.

21113000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113000221 is an equidigital number, since it uses as much as digits as its factorization.

21113000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21113000221 its reverse (12200031112), we get a palindrome (33313031333).

The spelling of 21113000221 in words is "twenty-one billion, one hundred thirteen million, two hundred twenty-one", and thus it is an aban number.