221020032231 has 12 divisors (see below), whose sum is σ = 319269273960. Its totient is φ = 147338326800.

The previous prime is 221020032223. The next prime is 221020032253. The reversal of 221020032231 is 132230020122.

It is not a de Polignac number, because 221020032231 - 2³ = 221020032223 is a prime.

It is a super-2 number, since 2×221020032231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020012231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 527196 + ... + 848513.

It is an arithmetic number, because the mean of its divisors is an integer number (26605772830).

Almost surely, 2^221020032231 is an apocalyptic number.

221020032231 is a deficient number, since it is larger than the sum of its proper divisors (98249241729).

221020032231 is a wasteful number, since it uses less digits than its factorization.

221020032231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393566 (or 1393563 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 221020032231 its reverse (132230020122), we get a palindrome (353250052353).

The spelling of 221020032231 in words is "two hundred twenty-one billion, twenty million, thirty-two thousand, two hundred thirty-one".