221026005 has 24 divisors (see below), whose sum is σ = 384733440. Its totient is φ = 117381600.

The previous prime is 221025983. The next prime is 221026009. The reversal of 221026005 is 500620122.

It is not a de Polignac number, because 221026005 - 2¹⁶ = 220960469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221026009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 480 + ... + 21030.

It is an arithmetic number, because the mean of its divisors is an integer number (16030560).

Almost surely, 2^221026005 is an apocalyptic number.

It is an amenable number.

221026005 is a deficient number, since it is larger than the sum of its proper divisors (163707435).

221026005 is a wasteful number, since it uses less digits than its factorization.

221026005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20801 (or 20798 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 221026005 is about 14866.9433643907. The cubic root of 221026005 is about 604.6180728134.

Adding to 221026005 its reverse (500620122), we get a palindrome (721646127).

The spelling of 221026005 in words is "two hundred twenty-one million, twenty-six thousand, five".