221101012 has 48 divisors (see below), whose sum is σ = 435580992. Its totient is φ = 97332480.

The previous prime is 221101007. The next prime is 221101039. The reversal of 221101012 is 210101122.

It is a self number, because there is not a number n which added to its sum of digits gives 221101012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258778 + ... + 259630.

It is an arithmetic number, because the mean of its divisors is an integer number (9074604).

Almost surely, 2^221101012 is an apocalyptic number.

221101012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221101012 is a deficient number, since it is larger than the sum of its proper divisors (214479980).

221101012 is a wasteful number, since it uses less digits than its factorization.

221101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048 (or 1046 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221101012 is about 14869.4657604098. The cubic root of 221101012 is about 604.6864591235.

Adding to 221101012 its reverse (210101122), we get a palindrome (431202134).

The spelling of 221101012 in words is "two hundred twenty-one million, one hundred one thousand, twelve".