20010212210221 has 4 divisors (see below), whose sum is σ = 20051987184000. Its totient is φ = 19968437236444.

The previous prime is 20010212210203. The next prime is 20010212210237. The reversal of 20010212210221 is 12201221201002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20010212210221 - 2³³ = 20001622275629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010212210195 and 20010212210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010215210221) 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, 20887486171 + ... + 20887487128.

It is an arithmetic number, because the mean of its divisors is an integer number (5012996796000).

Almost surely, 2^{20010212210221} is an apocalyptic number.

It is an amenable number.

20010212210221 is a deficient number, since it is larger than the sum of its proper divisors (41774973779).

20010212210221 is an equidigital number, since it uses as much as digits as its factorization.

20010212210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41774973778.

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

Adding to 20010212210221 its reverse (12201221201002), we get a palindrome (32211433411223).

The spelling of 20010212210221 in words is "twenty trillion, ten billion, two hundred twelve million, two hundred ten thousand, two hundred twenty-one".