221906012 has 12 divisors (see below), whose sum is σ = 388661616. Its totient is φ = 110859840.

The previous prime is 221906011. The next prime is 221906033. The reversal of 221906012 is 210609122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221906011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17789 + ... + 27572.

It is an arithmetic number, because the mean of its divisors is an integer number (32388468).

Almost surely, 2^221906012 is an apocalyptic number.

It is an amenable number.

221906012 is a deficient number, since it is larger than the sum of its proper divisors (166755604).

221906012 is a wasteful number, since it uses less digits than its factorization.

221906012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46588 (or 46586 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 221906012 is about 14896.5100610848. The cubic root of 221906012 is about 605.4194318474.

The spelling of 221906012 in words is "two hundred twenty-one million, nine hundred six thousand, twelve".