21202000221 has 16 divisors (see below), whose sum is σ = 29969934848. Its totient is φ = 13309012800.

The previous prime is 21202000217. The next prime is 21202000229. The reversal of 21202000221 is 12200020212.

It is not a de Polignac number, because 21202000221 - 2² = 21202000217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202000197 and 21202000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202000229) 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 15 ways as a sum of consecutive naturals, for example, 3077350 + ... + 3084231.

It is an arithmetic number, because the mean of its divisors is an integer number (1873120928).

Almost surely, 2^21202000221 is an apocalyptic number.

It is an amenable number.

21202000221 is a deficient number, since it is larger than the sum of its proper divisors (8767934627).

21202000221 is a wasteful number, since it uses less digits than its factorization.

21202000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6161652.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21202000221 its reverse (12200020212), we get a palindrome (33402020433).

The spelling of 21202000221 in words is "twenty-one billion, two hundred two million, two hundred twenty-one", and thus it is an aban number.