20211102221 has 8 divisors (see below), whose sum is σ = 20295970200. Its totient is φ = 20126306880.

The previous prime is 20211102193. The next prime is 20211102253. The reversal of 20211102221 is 12220111202.

It can be written as a sum of positive squares in 4 ways, for example, as 2224537225 + 17986564996 = 47165^2 + 134114^2 .

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 20211102221 - 2¹⁴ = 20211085837 is a prime.

It is a super-2 number, since 2×20211102221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20211102196 and 20211102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211101221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 580535 + ... + 614363.

It is an arithmetic number, because the mean of its divisors is an integer number (2536996275).

Almost surely, 2^20211102221 is an apocalyptic number.

It is an amenable number.

20211102221 is a deficient number, since it is larger than the sum of its proper divisors (84867979).

20211102221 is a wasteful number, since it uses less digits than its factorization.

20211102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36319.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20211102221 its reverse (12220111202), we get a palindrome (32431213423).

The spelling of 20211102221 in words is "twenty billion, two hundred eleven million, one hundred two thousand, two hundred twenty-one".