221144126 has 64 divisors (see below), whose sum is σ = 425502720. Its totient is φ = 83973120.

The previous prime is 221144117. The next prime is 221144129. The reversal of 221144126 is 621441122.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221144129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 388370 + ... + 388938.

It is an arithmetic number, because the mean of its divisors is an integer number (6648480).

Almost surely, 2^221144126 is an apocalyptic number.

221144126 is a deficient number, since it is larger than the sum of its proper divisors (204358594).

221144126 is a wasteful number, since it uses less digits than its factorization.

221144126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689.

The product of its digits is 768, while the sum is 23.

The square root of 221144126 is about 14870.9154392055. The cubic root of 221144126 is about 604.7257605532.

Adding to 221144126 its reverse (621441122), we get a palindrome (842585248).

The spelling of 221144126 in words is "two hundred twenty-one million, one hundred forty-four thousand, one hundred twenty-six".