221001201 has 12 divisors (see below), whose sum is σ = 329521920. Its totient is φ = 142581240.

The previous prime is 221001167. The next prime is 221001223. The reversal of 221001201 is 102100122.

It is not a de Polignac number, because 221001201 - 2¹¹ = 220999153 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221001271) 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, 395781 + ... + 396338.

It is an arithmetic number, because the mean of its divisors is an integer number (27460160).

Almost surely, 2^221001201 is an apocalyptic number.

It is an amenable number.

221001201 is a deficient number, since it is larger than the sum of its proper divisors (108520719).

221001201 is a wasteful number, since it uses less digits than its factorization.

221001201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792156 (or 792153 counting only the distinct ones).

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

The square root of 221001201 is about 14866.1091412649. The cubic root of 221001201 is about 604.5954547996.

Adding to 221001201 its reverse (102100122), we get a palindrome (323101323).

The spelling of 221001201 in words is "two hundred twenty-one million, one thousand, two hundred one".