20112020221 has 4 divisors (see below), whose sum is σ = 21295080252. Its totient is φ = 18928960192.

The previous prime is 20112020197. The next prime is 20112020263. The reversal of 20112020221 is 12202021102.

It is a happy number.

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 14917935321 + 5194084900 = 122139^2 + 72070^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112020221 - 2¹³ = 20112012029 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 (20112020281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591529990 + ... + 591530023.

It is an arithmetic number, because the mean of its divisors is an integer number (5323770063).

Almost surely, 2^20112020221 is an apocalyptic number.

It is an amenable number.

20112020221 is a deficient number, since it is larger than the sum of its proper divisors (1183060031).

20112020221 is a wasteful number, since it uses less digits than its factorization.

20112020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183060030.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20112020221 its reverse (12202021102), we get a palindrome (32314041323).

The spelling of 20112020221 in words is "twenty billion, one hundred twelve million, twenty thousand, two hundred twenty-one".