221352220 has 24 divisors (see below), whose sum is σ = 466149600. Its totient is φ = 88291392.

The previous prime is 221352217. The next prime is 221352251. The reversal of 221352220 is 22253122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8235 + ... + 22594.

It is an arithmetic number, because the mean of its divisors is an integer number (19422900).

Almost surely, 2^221352220 is an apocalyptic number.

221352220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221352220 is an abundant number, since it is smaller than the sum of its proper divisors (244797380).

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

221352220 is a wasteful number, since it uses less digits than its factorization.

221352220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31197 (or 31195 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 221352220 is about 14877.9104715682. The cubic root of 221352220 is about 604.9153810118.

The spelling of 221352220 in words is "two hundred twenty-one million, three hundred fifty-two thousand, two hundred twenty".