201020210021221 has 4 divisors (see below), whose sum is σ = 203010509130444. Its totient is φ = 199029910912000.

The previous prime is 201020210021207. The next prime is 201020210021237. The reversal of 201020210021221 is 122120012020102.

It is a happy number.

201020210021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 100752811504900 + 100267398516321 = 10037570^2 + 10013361^2 .

It is a cyclic number.

It is not a de Polignac number, because 201020210021221 - 2¹¹ = 201020210019173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201020210021195 and 201020210021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020210021201) 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, 995149554460 + ... + 995149554661.

It is an arithmetic number, because the mean of its divisors is an integer number (50752627282611).

Almost surely, 2^{201020210021221} is an apocalyptic number.

It is an amenable number.

201020210021221 is a deficient number, since it is larger than the sum of its proper divisors (1990299109223).

201020210021221 is a wasteful number, since it uses less digits than its factorization.

201020210021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990299109222.

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

Adding to 201020210021221 its reverse (122120012020102), we get a palindrome (323140222041323).

The spelling of 201020210021221 in words is "two hundred one trillion, twenty billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".