221440443012 has 18 divisors (see below), whose sum is σ = 559752231038. Its totient is φ = 73813480992.

The previous prime is 221440442963. The next prime is 221440443019. The reversal of 221440443012 is 210344044122.

221440443012 is a `hidden beast` number, since 2 + 214 + 4 + 0 + 4 + 430 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 221439889476 + 553536 = 470574^2 + 744^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (221440443019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3075561673 + ... + 3075561744.

Almost surely, 2^221440443012 is an apocalyptic number.

It is an amenable number.

221440443012 is an abundant number, since it is smaller than the sum of its proper divisors (338311788026).

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

221440443012 is a wasteful number, since it uses less digits than its factorization.

221440443012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6151123427 (or 6151123422 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 221440443012 its reverse (210344044122), we get a palindrome (431784487134).

The spelling of 221440443012 in words is "two hundred twenty-one billion, four hundred forty million, four hundred forty-three thousand, twelve".