221520112 has 20 divisors (see below), whose sum is σ = 468213336. Its totient is φ = 100690880.

The previous prime is 221520077. The next prime is 221520113. The reversal of 221520112 is 211025122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221520113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629143 + ... + 629494.

Almost surely, 2^221520112 is an apocalyptic number.

221520112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221520112 is an abundant number, since it is smaller than the sum of its proper divisors (246693224).

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

221520112 is a wasteful number, since it uses less digits than its factorization.

221520112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258656 (or 1258650 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 221520112 is about 14883.5517266545. The cubic root of 221520112 is about 605.0682817999.

Adding to 221520112 its reverse (211025122), we get a palindrome (432545234).

The spelling of 221520112 in words is "two hundred twenty-one million, five hundred twenty thousand, one hundred twelve".