201043421221 has 4 divisors (see below), whose sum is σ = 201044321452. Its totient is φ = 201042520992.

The previous prime is 201043421209. The next prime is 201043421231. The reversal of 201043421221 is 122124340102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 61757717121 + 139285704100 = 248511^2 + 373210^2 .

It is a cyclic number.

It is not a de Polignac number, because 201043421221 - 2⁷ = 201043421093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201043421192 and 201043421201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201043421231) 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, 165811 + ... + 655423.

It is an arithmetic number, because the mean of its divisors is an integer number (50261080363).

Almost surely, 2^201043421221 is an apocalyptic number.

It is an amenable number.

201043421221 is a deficient number, since it is larger than the sum of its proper divisors (900231).

201043421221 is an equidigital number, since it uses as much as digits as its factorization.

201043421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900230.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 201043421221 its reverse (122124340102), we get a palindrome (323167761323).

The spelling of 201043421221 in words is "two hundred one billion, forty-three million, four hundred twenty-one thousand, two hundred twenty-one".