201220721206 has 16 divisors (see below), whose sum is σ = 318450711600. Its totient is φ = 95094943488.

The previous prime is 201220721203. The next prime is 201220721213. The reversal of 201220721206 is 602127022102.

201220721206 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220721203) 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, 6098191 + ... + 6131098.

It is an arithmetic number, because the mean of its divisors is an integer number (19903169475).

Almost surely, 2^201220721206 is an apocalyptic number.

201220721206 is a deficient number, since it is larger than the sum of its proper divisors (117229990394).

201220721206 is a wasteful number, since it uses less digits than its factorization.

201220721206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12229743.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 201220721206 its reverse (602127022102), we get a palindrome (803347743308).

The spelling of 201220721206 in words is "two hundred one billion, two hundred twenty million, seven hundred twenty-one thousand, two hundred six".