20211110221 has 4 divisors (see below), whose sum is σ = 20316927744. Its totient is φ = 20105292700.

The previous prime is 20211110203. The next prime is 20211110239. The reversal of 20211110221 is 12201111202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20211110203) and next prime (20211110239).

It is a cyclic number.

It is not a de Polignac number, because 20211110221 - 2⁵ = 20211110189 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 (20211110261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52908475 + ... + 52908856.

It is an arithmetic number, because the mean of its divisors is an integer number (5079231936).

Almost surely, 2^20211110221 is an apocalyptic number.

It is an amenable number.

20211110221 is a deficient number, since it is larger than the sum of its proper divisors (105817523).

20211110221 is a wasteful number, since it uses less digits than its factorization.

20211110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105817522.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20211110221 its reverse (12201111202), we get a palindrome (32412221423).

The spelling of 20211110221 in words is "twenty billion, two hundred eleven million, one hundred ten thousand, two hundred twenty-one".