221001033 has 16 divisors (see below), whose sum is σ = 323592192. Its totient is φ = 133050000.

The previous prime is 221001031. The next prime is 221001049. The reversal of 221001033 is 330100122.

It is a happy number.

It is not a de Polignac number, because 221001033 - 2¹ = 221001031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221001031) 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, 17193 + ... + 27158.

It is an arithmetic number, because the mean of its divisors is an integer number (20224512).

Almost surely, 2^221001033 is an apocalyptic number.

It is an amenable number.

221001033 is a deficient number, since it is larger than the sum of its proper divisors (102591159).

221001033 is a wasteful number, since it uses less digits than its factorization.

221001033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44516.

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

The square root of 221001033 is about 14866.1034908277. The cubic root of 221001033 is about 604.5953015997.

Adding to 221001033 its reverse (330100122), we get a palindrome (551101155).

The spelling of 221001033 in words is "two hundred twenty-one million, one thousand, thirty-three".