21210010002221 has 8 divisors (see below), whose sum is σ = 21942419491200. Its totient is φ = 20477669168880.

The previous prime is 21210010002211. The next prime is 21210010002257. The reversal of 21210010002221 is 12220001001212.

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

It is a cyclic number.

It is not a de Polignac number, because 21210010002221 - 2³⁰ = 21208936260397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210010002196 and 21210010002205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210010002211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16534985 + ... + 17771486.

It is an arithmetic number, because the mean of its divisors is an integer number (2742802436400).

Almost surely, 2^{21210010002221} is an apocalyptic number.

It is an amenable number.

21210010002221 is a deficient number, since it is larger than the sum of its proper divisors (732409488979).

21210010002221 is a wasteful number, since it uses less digits than its factorization.

21210010002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34327819.

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

Adding to 21210010002221 its reverse (12220001001212), we get a palindrome (33430011003433).

The spelling of 21210010002221 in words is "twenty-one trillion, two hundred ten billion, ten million, two thousand, two hundred twenty-one".