221300031 has 4 divisors (see below), whose sum is σ = 295066712. Its totient is φ = 147533352.

The previous prime is 221300021. The next prime is 221300039. The reversal of 221300031 is 130003122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221300031 - 2¹⁰ = 221299007 is a prime.

It is a super-2 number, since 2×221300031² = 97947407441201922, which 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 (221300039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36883336 + ... + 36883341.

It is an arithmetic number, because the mean of its divisors is an integer number (73766678).

Almost surely, 2^221300031 is an apocalyptic number.

221300031 is a deficient number, since it is larger than the sum of its proper divisors (73766681).

221300031 is an equidigital number, since it uses as much as digits as its factorization.

221300031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73766680.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 221300031 is about 14876.1564592471. The cubic root of 221300031 is about 604.8678362582.

Adding to 221300031 its reverse (130003122), we get a palindrome (351303153).

It can be divided in two parts, 22 and 1300031, that multiplied together give a palindrome (28600682).

The spelling of 221300031 in words is "two hundred twenty-one million, three hundred thousand, thirty-one".