20021110221 has 8 divisors (see below), whose sum is σ = 30508358464. Its totient is φ = 11440634400.

The previous prime is 20021110177. The next prime is 20021110223. The reversal of 20021110221 is 12201112002.

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

It is not a de Polignac number, because 20021110221 - 2⁷ = 20021110093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021110197 and 20021110206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021110223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476693080 + ... + 476693121.

It is an arithmetic number, because the mean of its divisors is an integer number (3813544808).

Almost surely, 2^20021110221 is an apocalyptic number.

20021110221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20021110221 is a deficient number, since it is larger than the sum of its proper divisors (10487248243).

20021110221 is an equidigital number, since it uses as much as digits as its factorization.

20021110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953386211.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021110221 its reverse (12201112002), we get a palindrome (32222222223).

The spelling of 20021110221 in words is "twenty billion, twenty-one million, one hundred ten thousand, two hundred twenty-one".