201000001221 has 12 divisors (see below), whose sum is σ = 290373023148. Its totient is φ = 133981683264.

The previous prime is 201000001193. The next prime is 201000001259. The reversal of 201000001221 is 122100000102.

201000001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 58539802500 + 142460198721 = 241950^2 + 377439^2 .

It is not a de Polignac number, because 201000001221 - 2⁹ = 201000000709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201000002221) 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 11 ways as a sum of consecutive naturals, for example, 1456800 + ... + 1588793.

It is an arithmetic number, because the mean of its divisors is an integer number (24197751929).

Almost surely, 2^201000001221 is an apocalyptic number.

It is an amenable number.

201000001221 is a deficient number, since it is larger than the sum of its proper divisors (89373021927).

201000001221 is a wasteful number, since it uses less digits than its factorization.

201000001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052932 (or 3052929 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 201000001221 its reverse (122100000102), we get a palindrome (323100001323).

The spelling of 201000001221 in words is "two hundred one billion, one thousand, two hundred twenty-one".