21210010200221 has 4 divisors (see below), whose sum is σ = 21210108109344. Its totient is φ = 21209912291100.

The previous prime is 21210010200199. The next prime is 21210010200359. The reversal of 21210010200221 is 12200201001212.

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 21210010200221 - 2⁶ = 21210010200157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210010200196 and 21210010200205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210810200221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48628895 + ... + 49063116.

It is an arithmetic number, because the mean of its divisors is an integer number (5302527027336).

Almost surely, 2^{21210010200221} is an apocalyptic number.

It is an amenable number.

21210010200221 is a deficient number, since it is larger than the sum of its proper divisors (97909123).

21210010200221 is an equidigital number, since it uses as much as digits as its factorization.

21210010200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97909122.

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

Adding to 21210010200221 its reverse (12200201001212), we get a palindrome (33410211201433).

The spelling of 21210010200221 in words is "twenty-one trillion, two hundred ten billion, ten million, two hundred thousand, two hundred twenty-one".