201021211021 has 8 divisors (see below), whose sum is σ = 205726878720. Its totient is φ = 196333402608.

The previous prime is 201021210977. The next prime is 201021211033. The reversal of 201021211021 is 120112120102.

201021211021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201021211021 - 2¹⁷ = 201021079949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201021210992 and 201021211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021211051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4442046 + ... + 4487071.

It is an arithmetic number, because the mean of its divisors is an integer number (25715859840).

Almost surely, 2^201021211021 is an apocalyptic number.

It is an amenable number.

201021211021 is a deficient number, since it is larger than the sum of its proper divisors (4705667699).

201021211021 is an equidigital number, since it uses as much as digits as its factorization.

201021211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8929643.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201021211021 its reverse (120112120102), we get a palindrome (321133331123).

The spelling of 201021211021 in words is "two hundred one billion, twenty-one million, two hundred eleven thousand, twenty-one".