221033001 has 16 divisors (see below), whose sum is σ = 337065344. Its totient is φ = 126209664.

The previous prime is 221032993. The next prime is 221033051. The reversal of 221033001 is 100330122.

It is a happy number.

It is not a de Polignac number, because 221033001 - 2³ = 221032993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221033051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32445 + ... + 38661.

It is an arithmetic number, because the mean of its divisors is an integer number (21066584).

Almost surely, 2^221033001 is an apocalyptic number.

221033001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221033001 is a deficient number, since it is larger than the sum of its proper divisors (116032343).

221033001 is a wasteful number, since it uses less digits than its factorization.

221033001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7920.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 221033001 is about 14867.1786496295. The cubic root of 221033001 is about 604.6244519473.

Adding to 221033001 its reverse (100330122), we get a palindrome (321363123).

The spelling of 221033001 in words is "two hundred twenty-one million, thirty-three thousand, one".