21110202000221 has 4 divisors (see below), whose sum is σ = 21119060668992. Its totient is φ = 21101343331452.

The previous prime is 21110202000161. The next prime is 21110202000247. The reversal of 21110202000221 is 12200020201112.

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 21110202000221 - 2⁶ = 21110202000157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110202000196 and 21110202000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110202020221) 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, 4429330811 + ... + 4429335576.

It is an arithmetic number, because the mean of its divisors is an integer number (5279765167248).

Almost surely, 2^{21110202000221} is an apocalyptic number.

It is an amenable number.

21110202000221 is a deficient number, since it is larger than the sum of its proper divisors (8858668771).

21110202000221 is an equidigital number, since it uses as much as digits as its factorization.

21110202000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8858668770.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21110202000221 its reverse (12200020201112), we get a palindrome (33310222201333).

The spelling of 21110202000221 in words is "twenty-one trillion, one hundred ten billion, two hundred two million, two hundred twenty-one", and thus it is an aban number.