201001221 has 12 divisors (see below), whose sum is σ = 297087648. Its totient is φ = 130884264.

The previous prime is 201001219. The next prime is 201001243. The reversal of 201001221 is 122100102.

201001221 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 201001221 - 2¹ = 201001219 is a prime.

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

201001221 is a modest number, since divided by 1221 gives 201 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201001321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259305 + ... + 260078.

It is an arithmetic number, because the mean of its divisors is an integer number (24757304).

Almost surely, 2^201001221 is an apocalyptic number.

It is an amenable number.

201001221 is a deficient number, since it is larger than the sum of its proper divisors (96086427).

201001221 is a wasteful number, since it uses less digits than its factorization.

201001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519432 (or 519429 counting only the distinct ones).

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

The square root of 201001221 is about 14177.4899400423. The cubic root of 201001221 is about 585.7777863874. Note that the first 4 decimals are identical.

Adding to 201001221 its reverse (122100102), we get a palindrome (323101323).

It can be divided in two parts, 20100 and 1221, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 201001221 in words is "two hundred one million, one thousand, two hundred twenty-one".