222531012 has 36 divisors (see below), whose sum is σ = 613647216. Its totient is φ = 67433520.

The previous prime is 222530981. The next prime is 222531017. The reversal of 222531012 is 210135222.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (222531017) 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 11 ways as a sum of consecutive naturals, for example, 280578 + ... + 281369.

It is an arithmetic number, because the mean of its divisors is an integer number (17045756).

Almost surely, 2^222531012 is an apocalyptic number.

222531012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

222531012 is an abundant number, since it is smaller than the sum of its proper divisors (391116204).

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

222531012 is a wasteful number, since it uses less digits than its factorization.

222531012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561968 (or 561963 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 222531012 is about 14917.4733785584. The cubic root of 222531012 is about 605.9872885613.

Adding to 222531012 its reverse (210135222), we get a palindrome (432666234).

The spelling of 222531012 in words is "two hundred twenty-two million, five hundred thirty-one thousand, twelve".