221321310220 has 48 divisors (see below), whose sum is σ = 471549986208. Its totient is φ = 87246581760.

The previous prime is 221321310169. The next prime is 221321310233. The reversal of 221321310220 is 22013123122.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145090 + ... + 680950.

It is an arithmetic number, because the mean of its divisors is an integer number (9823958046).

Almost surely, 2^221321310220 is an apocalyptic number.

221321310220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221321310220 is an abundant number, since it is smaller than the sum of its proper divisors (250228675988).

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

221321310220 is a wasteful number, since it uses less digits than its factorization.

221321310220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536170 (or 536168 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221321310220 its reverse (22013123122), we get a palindrome (243334433342).

The spelling of 221321310220 in words is "two hundred twenty-one billion, three hundred twenty-one million, three hundred ten thousand, two hundred twenty".