220123231 has 4 divisors (see below), whose sum is σ = 224806752. Its totient is φ = 215439712.

The previous prime is 220123229. The next prime is 220123247. The reversal of 220123231 is 132321022.

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

It is a cyclic number.

It is not a de Polignac number, because 220123231 - 2¹ = 220123229 is a prime.

It is a super-2 number, since 2×220123231² = 96908473651758722, 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 (220123031) 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, 2341690 + ... + 2341783.

It is an arithmetic number, because the mean of its divisors is an integer number (56201688).

Almost surely, 2^220123231 is an apocalyptic number.

220123231 is a deficient number, since it is larger than the sum of its proper divisors (4683521).

220123231 is an equidigital number, since it uses as much as digits as its factorization.

220123231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4683520.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 220123231 is about 14836.5505087942. The cubic root of 220123231 is about 603.7937681293.

Adding to 220123231 its reverse (132321022), we get a palindrome (352444253).

The spelling of 220123231 in words is "two hundred twenty million, one hundred twenty-three thousand, two hundred thirty-one".