221555630 has 16 divisors (see below), whose sum is σ = 409579200. Its totient is φ = 86226912.

The previous prime is 221555617. The next prime is 221555647. The reversal of 221555630 is 36555122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221555593 and 221555602.

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, 299030 + ... + 299769.

It is an arithmetic number, because the mean of its divisors is an integer number (25598700).

Almost surely, 2^221555630 is an apocalyptic number.

221555630 is a deficient number, since it is larger than the sum of its proper divisors (188023570).

221555630 is a wasteful number, since it uses less digits than its factorization.

221555630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598843.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 221555630 is about 14884.7448752070. The cubic root of 221555630 is about 605.1006184676.

The spelling of 221555630 in words is "two hundred twenty-one million, five hundred fifty-five thousand, six hundred thirty".