221003021231 has 16 divisors (see below), whose sum is σ = 229568939040. Its totient is φ = 212590241280.

The previous prime is 221003021191. The next prime is 221003021233. The reversal of 221003021231 is 132120300122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221003021231 is a prime.

It is a super-2 number, since 2×221003021231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221003021233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10893365 + ... + 10913633.

It is an arithmetic number, because the mean of its divisors is an integer number (14348058690).

Almost surely, 2^221003021231 is an apocalyptic number.

221003021231 is a deficient number, since it is larger than the sum of its proper divisors (8565917809).

221003021231 is a wasteful number, since it uses less digits than its factorization.

221003021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24026.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 221003021231 its reverse (132120300122), we get a palindrome (353123321353).

The spelling of 221003021231 in words is "two hundred twenty-one billion, three million, twenty-one thousand, two hundred thirty-one".