20111000221 has 16 divisors (see below), whose sum is σ = 22970821104. Its totient is φ = 17442422784.

The previous prime is 20111000207. The next prime is 20111000263. The reversal of 20111000221 is 12200011102.

It can be written as a sum of positive squares in 8 ways, for example, as 2259100900 + 17851899321 = 47530^2 + 133611^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111000221 - 2¹³ = 20110992029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111000198 and 20111000207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111000821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54325 + ... + 207781.

It is an arithmetic number, because the mean of its divisors is an integer number (1435676319).

Almost surely, 2^20111000221 is an apocalyptic number.

It is an amenable number.

20111000221 is a deficient number, since it is larger than the sum of its proper divisors (2859820883).

20111000221 is a wasteful number, since it uses less digits than its factorization.

20111000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154080.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20111000221 its reverse (12200011102), we get a palindrome (32311011323).

The spelling of 20111000221 in words is "twenty billion, one hundred eleven million, two hundred twenty-one", and thus it is an aban number.