221366620 has 24 divisors (see below), whose sum is σ = 467445888. Its totient is φ = 88056000.

The previous prime is 221366609. The next prime is 221366633. The reversal of 221366620 is 26663122.

It is a happy number.

221366620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 26956 + ... + 34195.

It is an arithmetic number, because the mean of its divisors is an integer number (19476912).

Almost surely, 2^221366620 is an apocalyptic number.

221366620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221366620 is an abundant number, since it is smaller than the sum of its proper divisors (246079268).

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

221366620 is a wasteful number, since it uses less digits than its factorization.

221366620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61341 (or 61339 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 221366620 is about 14878.3944026229. The cubic root of 221366620 is about 604.9284982548.

The spelling of 221366620 in words is "two hundred twenty-one million, three hundred sixty-six thousand, six hundred twenty".