221620330 has 32 divisors (see below), whose sum is σ = 424569600. Its totient is φ = 83001600.

The previous prime is 221620297. The next prime is 221620337. The reversal of 221620330 is 33026122.

221620330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221620298 and 221620307.

It is not an unprimeable number, because it can be changed into a prime (221620337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30555 + ... + 37105.

It is an arithmetic number, because the mean of its divisors is an integer number (13267800).

Almost surely, 2^221620330 is an apocalyptic number.

221620330 is a deficient number, since it is larger than the sum of its proper divisors (202949270).

221620330 is a wasteful number, since it uses less digits than its factorization.

221620330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6774.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 221620330 is about 14886.9180826657. The cubic root of 221620330 is about 605.1595144353.

Adding to 221620330 its reverse (33026122), we get a palindrome (254646452).

The spelling of 221620330 in words is "two hundred twenty-one million, six hundred twenty thousand, three hundred thirty".