221252320 has 24 divisors (see below), whose sum is σ = 522708984. Its totient is φ = 88500864.

The previous prime is 221252293. The next prime is 221252323. The reversal of 221252320 is 23252122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221252323) 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, 691254 + ... + 691573.

It is an arithmetic number, because the mean of its divisors is an integer number (21779541).

Almost surely, 2^221252320 is an apocalyptic number.

221252320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221252320 is an abundant number, since it is smaller than the sum of its proper divisors (301456664).

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

221252320 is a wasteful number, since it uses less digits than its factorization.

221252320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382842 (or 1382834 counting only the distinct ones).

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

The square root of 221252320 is about 14874.5527663860. The cubic root of 221252320 is about 604.8243644711.

The spelling of 221252320 in words is "two hundred twenty-one million, two hundred fifty-two thousand, three hundred twenty".