20112100100221 has 8 divisors (see below), whose sum is σ = 20128480293240. Its totient is φ = 20095720896768.

The previous prime is 20112100100167. The next prime is 20112100100227. The reversal of 20112100100221 is 12200100121102.

It can be written as a sum of positive squares in 4 ways, for example, as 4842090225625 + 15270009874596 = 2200475^2 + 3907686^2 .

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 20112100100221 - 2⁷ = 20112100100093 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 (20112100100227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43567665 + ... + 44026873.

It is an arithmetic number, because the mean of its divisors is an integer number (2516060036655).

Almost surely, 2^{20112100100221} is an apocalyptic number.

It is an amenable number.

20112100100221 is a deficient number, since it is larger than the sum of its proper divisors (16380193019).

20112100100221 is a wasteful number, since it uses less digits than its factorization.

20112100100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494783.

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

Adding to 20112100100221 its reverse (12200100121102), we get a palindrome (32312200221323).

The spelling of 20112100100221 in words is "twenty trillion, one hundred twelve billion, one hundred million, one hundred thousand, two hundred twenty-one".