221466830 has 64 divisors (see below), whose sum is σ = 452063808. Its totient is φ = 77552640.

The previous prime is 221466829. The next prime is 221466859. The reversal of 221466830 is 38664122.

221466830 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196649 + ... + 197771.

It is an arithmetic number, because the mean of its divisors is an integer number (7063497).

Almost surely, 2^221466830 is an apocalyptic number.

221466830 is an abundant number, since it is smaller than the sum of its proper divisors (230596978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221466830 is a wasteful number, since it uses less digits than its factorization.

221466830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 221466830 is about 14881.7616564706. The cubic root of 221466830 is about 605.0197657636.

It can be divided in two parts, 221 and 466830, that multiplied together give a triangular number (103169430 = T₁₄₃₆₄).

The spelling of 221466830 in words is "two hundred twenty-one million, four hundred sixty-six thousand, eight hundred thirty".