221076220 has 24 divisors (see below), whose sum is σ = 464711184. Its totient is φ = 88344576.

The previous prime is 221076209. The next prime is 221076259. The reversal of 221076220 is 22670122.

It is a junction number, because it is equal to n+sod(n) for n = 221076191 and 221076200.

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 7 ways as a sum of consecutive naturals, for example, 18267 + ... + 27853.

It is an arithmetic number, because the mean of its divisors is an integer number (19362966).

Almost surely, 2^221076220 is an apocalyptic number.

221076220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221076220 is an abundant number, since it is smaller than the sum of its proper divisors (243634964).

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

221076220 is a wasteful number, since it uses less digits than its factorization.

221076220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749 (or 10747 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 221076220 is about 14868.6320823403. The cubic root of 221076220 is about 604.6638571659.

The spelling of 221076220 in words is "two hundred twenty-one million, seventy-six thousand, two hundred twenty".