221123307 has 4 divisors (see below), whose sum is σ = 294831080. Its totient is φ = 147415536.

The previous prime is 221123303. The next prime is 221123333. The reversal of 221123307 is 703321122.

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

It is not a de Polignac number, because 221123307 - 2² = 221123303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221123303) 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, 36853882 + ... + 36853887.

It is an arithmetic number, because the mean of its divisors is an integer number (73707770).

Almost surely, 2^221123307 is an apocalyptic number.

221123307 is a deficient number, since it is larger than the sum of its proper divisors (73707773).

221123307 is an equidigital number, since it uses as much as digits as its factorization.

221123307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73707772.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 221123307 is about 14870.2154321987. The cubic root of 221123307 is about 604.7067832148.

Adding to 221123307 its reverse (703321122), we get a palindrome (924444429).

The spelling of 221123307 in words is "two hundred twenty-one million, one hundred twenty-three thousand, three hundred seven".