201021120205 has 4 divisors (see below), whose sum is σ = 241225344252. Its totient is φ = 160816896160.

The previous prime is 201021120203. The next prime is 201021120211. The reversal of 201021120205 is 502021120102.

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 43629601129 + 157391519076 = 208877^2 + 396726^2 .

It is not a de Polignac number, because 201021120205 - 2¹ = 201021120203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021120203) 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, 20102112016 + ... + 20102112025.

It is an arithmetic number, because the mean of its divisors is an integer number (60306336063).

Almost surely, 2^201021120205 is an apocalyptic number.

It is an amenable number.

201021120205 is a deficient number, since it is larger than the sum of its proper divisors (40204224047).

201021120205 is an equidigital number, since it uses as much as digits as its factorization.

201021120205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40204224046.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 201021120205 its reverse (502021120102), we get a palindrome (703042240307).

The spelling of 201021120205 in words is "two hundred one billion, twenty-one million, one hundred twenty thousand, two hundred five".