20212120100221 has 16 divisors (see below), whose sum is σ = 23117304697344. Its totient is φ = 17311373218944.

The previous prime is 20212120100141. The next prime is 20212120100267. The reversal of 20212120100221 is 12200102121202.

It is a happy number.

It is not a de Polignac number, because 20212120100221 - 2¹³ = 20212120092029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212120100195 and 20212120100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212120190221) 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, 83840371 + ... + 84081103.

It is an arithmetic number, because the mean of its divisors is an integer number (1444831543584).

Almost surely, 2^{20212120100221} is an apocalyptic number.

It is an amenable number.

20212120100221 is a deficient number, since it is larger than the sum of its proper divisors (2905184597123).

20212120100221 is a wasteful number, since it uses less digits than its factorization.

20212120100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249900.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20212120100221 its reverse (12200102121202), we get a palindrome (32412222221423).

The spelling of 20212120100221 in words is "twenty trillion, two hundred twelve billion, one hundred twenty million, one hundred thousand, two hundred twenty-one".