221123444 has 12 divisors (see below), whose sum is σ = 407332800. Its totient is φ = 104742648.

The previous prime is 221123429. The next prime is 221123447. The reversal of 221123444 is 444321122.

221123444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221123444² = 97791154972842272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221123447) 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, 1454684 + ... + 1454835.

It is an arithmetic number, because the mean of its divisors is an integer number (33944400).

Almost surely, 2^221123444 is an apocalyptic number.

It is an amenable number.

221123444 is a deficient number, since it is larger than the sum of its proper divisors (186209356).

221123444 is a wasteful number, since it uses less digits than its factorization.

221123444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909542 (or 2909540 counting only the distinct ones).

The product of its digits is 1536, while the sum is 23.

The square root of 221123444 is about 14870.2200387217. The cubic root of 221123444 is about 604.7069080996.

Adding to 221123444 its reverse (444321122), we get a palindrome (665444566).

The spelling of 221123444 in words is "two hundred twenty-one million, one hundred twenty-three thousand, four hundred forty-four".