221646530 has 32 divisors (see below), whose sum is σ = 464569344. Its totient is φ = 74558016.

The previous prime is 221646521. The next prime is 221646547. The reversal of 221646530 is 35646122.

221646530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221646530² = 98254368522081800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221646493 and 221646502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26162 + ... + 33581.

It is an arithmetic number, because the mean of its divisors is an integer number (14517792).

Almost surely, 2^221646530 is an apocalyptic number.

221646530 is an abundant number, since it is smaller than the sum of its proper divisors (242922814).

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

221646530 is a wasteful number, since it uses less digits than its factorization.

221646530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59810.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 221646530 is about 14887.7980238852. The cubic root of 221646530 is about 605.1833608555.

The spelling of 221646530 in words is "two hundred twenty-one million, six hundred forty-six thousand, five hundred thirty".