221143252 has 24 divisors (see below), whose sum is σ = 440540352. Its totient is φ = 96148800.

The previous prime is 221143249. The next prime is 221143253. The reversal of 221143252 is 252341122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221143253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108249 + ... + 110272.

It is an arithmetic number, because the mean of its divisors is an integer number (18355848).

Almost surely, 2^221143252 is an apocalyptic number.

221143252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221143252 is a deficient number, since it is larger than the sum of its proper divisors (219397100).

221143252 is a wasteful number, since it uses less digits than its factorization.

221143252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218559 (or 218557 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 221143252 is about 14870.8860529560. The cubic root of 221143252 is about 604.7249638917.

Adding to 221143252 its reverse (252341122), we get a palindrome (473484374).

The spelling of 221143252 in words is "two hundred twenty-one million, one hundred forty-three thousand, two hundred fifty-two".