20201010212221 has 4 divisors (see below), whose sum is σ = 20205558969244. Its totient is φ = 20196461455200.

The previous prime is 20201010212209. The next prime is 20201010212231. The reversal of 20201010212221 is 12221201010202.

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 6047320356900 + 14153689855321 = 2459130^2 + 3762139^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201010212221 - 2⁷ = 20201010212093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201010212195 and 20201010212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201010212231) 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, 2274371850 + ... + 2274380731.

It is an arithmetic number, because the mean of its divisors is an integer number (5051389742311).

Almost surely, 2^{20201010212221} is an apocalyptic number.

It is an amenable number.

20201010212221 is a deficient number, since it is larger than the sum of its proper divisors (4548757023).

20201010212221 is an equidigital number, since it uses as much as digits as its factorization.

20201010212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4548757022.

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

Adding to 20201010212221 its reverse (12221201010202), we get a palindrome (32422211222423).

The spelling of 20201010212221 in words is "twenty trillion, two hundred one billion, ten million, two hundred twelve thousand, two hundred twenty-one".