221303020 has 24 divisors (see below), whose sum is σ = 465670800. Its totient is φ = 88343232.

The previous prime is 221303009. The next prime is 221303063. The reversal of 221303020 is 20303122.

It is a happy number.

It is a super-2 number, since 2×221303020² = 97950053322240800, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 690 + ... + 21049.

It is an arithmetic number, because the mean of its divisors is an integer number (19402950).

Almost surely, 2^221303020 is an apocalyptic number.

221303020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221303020 is an abundant number, since it is smaller than the sum of its proper divisors (244367780).

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

221303020 is a wasteful number, since it uses less digits than its factorization.

221303020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22257 (or 22255 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 221303020 is about 14876.2569216856. The cubic root of 221303020 is about 604.8705594719.

Adding to 221303020 its reverse (20303122), we get a palindrome (241606142).

The spelling of 221303020 in words is "two hundred twenty-one million, three hundred three thousand, twenty".