20211210100221 has 16 divisors (see below), whose sum is σ = 32137079414784. Its totient is φ = 11047121048304.

The previous prime is 20211210100201. The next prime is 20211210100261. The reversal of 20211210100221 is 12200101211202.

It is not a de Polignac number, because 20211210100221 - 2¹¹ = 20211210098173 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20211210100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211210100201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20922577261 + ... + 20922578226.

It is an arithmetic number, because the mean of its divisors is an integer number (2008567463424).

Almost surely, 2^{20211210100221} is an apocalyptic number.

20211210100221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20211210100221 is a deficient number, since it is larger than the sum of its proper divisors (11925869314563).

20211210100221 is a wasteful number, since it uses less digits than its factorization.

20211210100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41845155520.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20211210100221 its reverse (12200101211202), we get a palindrome (32411311311423).

The spelling of 20211210100221 in words is "twenty trillion, two hundred eleven billion, two hundred ten million, one hundred thousand, two hundred twenty-one".