221644012 has 12 divisors (see below), whose sum is σ = 388200736. Its totient is φ = 110729520.

The previous prime is 221644001. The next prime is 221644019. The reversal of 221644012 is 210446122.

It is a happy number.

It is a super-2 number, since 2×221644012² = 98252136110912288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (221644019) 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 3 ways as a sum of consecutive naturals, for example, 17583 + ... + 27430.

Almost surely, 2^221644012 is an apocalyptic number.

It is an amenable number.

221644012 is a deficient number, since it is larger than the sum of its proper divisors (166556724).

221644012 is a wasteful number, since it uses less digits than its factorization.

221644012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46248 (or 46246 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 221644012 is about 14887.7134577476. The cubic root of 221644012 is about 605.1810691323.

The spelling of 221644012 in words is "two hundred twenty-one million, six hundred forty-four thousand, twelve".