221636630 has 8 divisors (see below), whose sum is σ = 398945952. Its totient is φ = 88654648.

The previous prime is 221636629. The next prime is 221636641. The reversal of 221636630 is 36636122.

221636630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221636593 and 221636602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11081822 + ... + 11081841.

It is an arithmetic number, because the mean of its divisors is an integer number (49868244).

Almost surely, 2^221636630 is an apocalyptic number.

221636630 is a deficient number, since it is larger than the sum of its proper divisors (177309322).

221636630 is a wasteful number, since it uses less digits than its factorization.

221636630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22163670.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 221636630 is about 14887.4655331255. The cubic root of 221636630 is about 605.1743504061.

The spelling of 221636630 in words is "two hundred twenty-one million, six hundred thirty-six thousand, six hundred thirty".