21202200221 has 8 divisors (see below), whose sum is σ = 21656001024. Its totient is φ = 20748511600.

The previous prime is 21202200197. The next prime is 21202200247. The reversal of 21202200221 is 12200220212.

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 21202200221 - 2⁶ = 21202200157 is a prime.

It is a super-2 number, since 2×21202200221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202200196 and 21202200205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202200251) 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, 434771 + ... + 481071.

It is an arithmetic number, because the mean of its divisors is an integer number (2707000128).

Almost surely, 2^21202200221 is an apocalyptic number.

It is an amenable number.

21202200221 is a deficient number, since it is larger than the sum of its proper divisors (453800803).

21202200221 is an equidigital number, since it uses as much as digits as its factorization.

21202200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56091.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21202200221 its reverse (12200220212), we get a palindrome (33402420433).

The spelling of 21202200221 in words is "twenty-one billion, two hundred two million, two hundred thousand, two hundred twenty-one".