201221221020201 has 32 divisors (see below), whose sum is σ = 315648642280320. Its totient is φ = 126253447898112.

The previous prime is 201221221020199. The next prime is 201221221020233. The reversal of 201221221020201 is 102020122122102.

It is a happy number.

201221221020201 is a `hidden beast` number, since 2 + 0 + 1 + 221 + 221 + 0 + 20 + 201 = 666.

201221221020201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201221221020201 - 2¹ = 201221221020199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201221221020601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14171526 + ... + 24561648.

It is an arithmetic number, because the mean of its divisors is an integer number (9864020071260).

Almost surely, 2^{201221221020201} is an apocalyptic number.

It is an amenable number.

201221221020201 is a deficient number, since it is larger than the sum of its proper divisors (114427421260119).

201221221020201 is a wasteful number, since it uses less digits than its factorization.

201221221020201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10432342 (or 10432336 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 201221221020201 its reverse (102020122122102), we get a palindrome (303241343142303).

The spelling of 201221221020201 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty thousand, two hundred one".