221012 has 12 divisors (see below), whose sum is σ = 422016. Its totient is φ = 100440.

The previous prime is 220973. The next prime is 221021. The reversal of 221012 is 210122.

221012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

221012 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 2468 + ... + 2555.

It is an arithmetic number, because the mean of its divisors is an integer number (35168).

2²²¹⁰¹² is an apocalyptic number.

221012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221012 is a deficient number, since it is larger than the sum of its proper divisors (201004).

221012 is a wasteful number, since it uses less digits than its factorization.

221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038 (or 5036 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 221012 is about 470.1191338374. The cubic root of 221012 is about 60.4605302288.

Adding to 221012 its reverse (210122), we get a palindrome (431134).

It can be divided in two parts, 2210 and 12, that added together give a palindrome (2222).

The spelling of 221012 in words is "two hundred twenty-one thousand, twelve", and thus it is an iban number.