20211020221 has 8 divisors (see below), whose sum is σ = 23390693120. Its totient is φ = 17104443408.

The previous prime is 20211020189. The next prime is 20211020279. The reversal of 20211020221 is 12202011202.

It is a happy number.

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 20211020221 - 2⁵ = 20211020189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211020021) 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, 18273426 + ... + 18274531.

It is an arithmetic number, because the mean of its divisors is an integer number (2923836640).

Almost surely, 2^20211020221 is an apocalyptic number.

It is an amenable number.

20211020221 is a deficient number, since it is larger than the sum of its proper divisors (3179672899).

20211020221 is an equidigital number, since it uses as much as digits as its factorization.

20211020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36548043.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20211020221 its reverse (12202011202), we get a palindrome (32413031423).

The spelling of 20211020221 in words is "twenty billion, two hundred eleven million, twenty thousand, two hundred twenty-one".