221144412 has 24 divisors (see below), whose sum is σ = 529950736. Its totient is φ = 71722368.

The previous prime is 221144411. The next prime is 221144419. The reversal of 221144412 is 214441122.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221144411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248593 + ... + 249480.

Almost surely, 2^221144412 is an apocalyptic number.

It is an amenable number.

221144412 is an abundant number, since it is smaller than the sum of its proper divisors (308806324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221144412 is a wasteful number, since it uses less digits than its factorization.

221144412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498117 (or 498115 counting only the distinct ones).

The product of its digits is 512, while the sum is 21.

The square root of 221144412 is about 14870.9250552883. The cubic root of 221144412 is about 604.7260212451.

Adding to 221144412 its reverse (214441122), we get a palindrome (435585534).

The spelling of 221144412 in words is "two hundred twenty-one million, one hundred forty-four thousand, four hundred twelve".