221001573 has 32 divisors (see below), whose sum is σ = 333849600. Its totient is φ = 129093120.

The previous prime is 221001541. The next prime is 221001589. The reversal of 221001573 is 375100122.

It is not a de Polignac number, because 221001573 - 2⁵ = 221001541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001593) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62353 + ... + 65801.

It is an arithmetic number, because the mean of its divisors is an integer number (10432800).

Almost surely, 2^221001573 is an apocalyptic number.

It is an amenable number.

221001573 is a deficient number, since it is larger than the sum of its proper divisors (112848027).

221001573 is a wasteful number, since it uses less digits than its factorization.

221001573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3549.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 221001573 is about 14866.1216529396. The cubic root of 221001573 is about 604.5957940276.

Adding to 221001573 its reverse (375100122), we get a palindrome (596101695).

The spelling of 221001573 in words is "two hundred twenty-one million, one thousand, five hundred seventy-three".