221224012 has 6 divisors (see below), whose sum is σ = 387142028. Its totient is φ = 110612004.

The previous prime is 221223997. The next prime is 221224013. The reversal of 221224012 is 210422122.

221224012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221224012² = 97880126970752288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221224013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27652998 + ... + 27653005.

Almost surely, 2^221224012 is an apocalyptic number.

It is an amenable number.

221224012 is a deficient number, since it is larger than the sum of its proper divisors (165918016).

221224012 is a wasteful number, since it uses less digits than its factorization.

221224012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55306007 (or 55306005 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221224012 is about 14873.6011779259. The cubic root of 221224012 is about 604.7985687365.

Adding to 221224012 its reverse (210422122), we get a palindrome (431646134).

The spelling of 221224012 in words is "two hundred twenty-one million, two hundred twenty-four thousand, twelve".