201221203021 has 8 divisors (see below), whose sum is σ = 205195291200. Its totient is φ = 197278781280.

The previous prime is 201221203013. The next prime is 201221203031. The reversal of 201221203021 is 120302122102.

It is a happy number.

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 201221203021 - 2³ = 201221203013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201221202986 and 201221203004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221203031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7903776 + ... + 7929193.

It is an arithmetic number, because the mean of its divisors is an integer number (25649411400).

Almost surely, 2^201221203021 is an apocalyptic number.

It is an amenable number.

201221203021 is a deficient number, since it is larger than the sum of its proper divisors (3974088179).

201221203021 is a wasteful number, since it uses less digits than its factorization.

201221203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15833219.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 201221203021 its reverse (120302122102), we get a palindrome (321523325123).

The spelling of 201221203021 in words is "two hundred one billion, two hundred twenty-one million, two hundred three thousand, twenty-one".