221007 has 8 divisors (see below), whose sum is σ = 307584. Its totient is φ = 140888.

The previous prime is 220973. The next prime is 221021. The reversal of 221007 is 700122.

221007 is nontrivially palindromic in base 13.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221007 - 2⁷ = 220879 is a prime.

221007 is an undulating number in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 220983 and 221001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221047) 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 7 ways as a sum of consecutive naturals, for example, 1533 + ... + 1670.

It is an arithmetic number, because the mean of its divisors is an integer number (38448).

2²²¹⁰⁰⁷ is an apocalyptic number.

221007 is a deficient number, since it is larger than the sum of its proper divisors (86577).

221007 is a wasteful number, since it uses less digits than its factorization.

221007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3229.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 221007 is about 470.1138160063. The cubic root of 221007 is about 60.4600742883.

Adding to 221007 its reverse (700122), we get a palindrome (921129).

The spelling of 221007 in words is "two hundred twenty-one thousand, seven", and thus it is an iban number.