21210110000221 has 8 divisors (see below), whose sum is σ = 22326501988800. Its totient is φ = 20093725052640.

The previous prime is 21210110000201. The next prime is 21210110000239. The reversal of 21210110000221 is 12200001101212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210110000221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210110000201) 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 7 ways as a sum of consecutive naturals, for example, 5110800 + ... + 8278918.

It is an arithmetic number, because the mean of its divisors is an integer number (2790812748600).

Almost surely, 2^{21210110000221} is an apocalyptic number.

It is an amenable number.

21210110000221 is a deficient number, since it is larger than the sum of its proper divisors (1116391988579).

21210110000221 is a wasteful number, since it uses less digits than its factorization.

21210110000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520499.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210110000221 its reverse (12200001101212), we get a palindrome (33410111101433).

The spelling of 21210110000221 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, two hundred twenty-one", and thus it is an aban number.