20211110022221 has 4 divisors (see below), whose sum is σ = 20704063925244. Its totient is φ = 19718156119200.

The previous prime is 20211110022157. The next prime is 20211110022227. The reversal of 20211110022221 is 12222001111202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 401177824996 + 19809932197225 = 633386^2 + 4450835^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211110022221 - 2⁶ = 20211110022157 is a prime.

It is a super-2 number, since 2×20211110022221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20211110022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211110022227) 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, 246476951450 + ... + 246476951531.

It is an arithmetic number, because the mean of its divisors is an integer number (5176015981311).

Almost surely, 2^{20211110022221} is an apocalyptic number.

It is an amenable number.

20211110022221 is a deficient number, since it is larger than the sum of its proper divisors (492953903023).

20211110022221 is an equidigital number, since it uses as much as digits as its factorization.

20211110022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492953903022.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20211110022221 its reverse (12222001111202), we get a palindrome (32433111133423).

The spelling of 20211110022221 in words is "twenty trillion, two hundred eleven billion, one hundred ten million, twenty-two thousand, two hundred twenty-one".