221123023 has 12 divisors (see below), whose sum is σ = 243412344. Its totient is φ = 200874520.

The previous prime is 221123017. The next prime is 221123047. The reversal of 221123023 is 320321122.

It is not a de Polignac number, because 221123023 - 2⁵ = 221122991 is a prime.

It is a hoax number, since the sum of its digits (16) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221122988 and 221123006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221123053) 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, 160365 + ... + 161737.

It is an arithmetic number, because the mean of its divisors is an integer number (20284362).

Almost surely, 2^221123023 is an apocalyptic number.

221123023 is a deficient number, since it is larger than the sum of its proper divisors (22289321).

221123023 is an frugal number, since it uses more digits than its factorization.

221123023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428 (or 1384 counting only the distinct ones).

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

The square root of 221123023 is about 14870.2058829056. The cubic root of 221123023 is about 604.7065243294.

Adding to 221123023 its reverse (320321122), we get a palindrome (541444145).

The spelling of 221123023 in words is "two hundred twenty-one million, one hundred twenty-three thousand, twenty-three".