20112011221 has 4 divisors (see below), whose sum is σ = 20190268332. Its totient is φ = 20033754112.

The previous prime is 20112011203. The next prime is 20112011263. The reversal of 20112011221 is 12211021102.

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 14069280996 + 6042730225 = 118614^2 + 77735^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112011221 - 2⁵ = 20112011189 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 (20112011201) 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, 39128170 + ... + 39128683.

It is an arithmetic number, because the mean of its divisors is an integer number (5047567083).

Almost surely, 2^20112011221 is an apocalyptic number.

It is an amenable number.

20112011221 is a deficient number, since it is larger than the sum of its proper divisors (78257111).

20112011221 is an equidigital number, since it uses as much as digits as its factorization.

20112011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78257110.

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

Adding to 20112011221 its reverse (12211021102), we get a palindrome (32323032323).

The spelling of 20112011221 in words is "twenty billion, one hundred twelve million, eleven thousand, two hundred twenty-one".