221110021320 has 64 divisors (see below), whose sum is σ = 674572968000. Its totient is φ = 57963303168.

The previous prime is 221110021289. The next prime is 221110021343. The reversal of 221110021320 is 23120011122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221110021320.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15608035 + ... + 15622194.

It is an arithmetic number, because the mean of its divisors is an integer number (10540202625).

Almost surely, 2^221110021320 is an apocalyptic number.

221110021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221110021320 is an abundant number, since it is smaller than the sum of its proper divisors (453462946680).

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

221110021320 is a wasteful number, since it uses less digits than its factorization.

221110021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31230302 (or 31230298 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221110021320 its reverse (23120011122), we get a palindrome (244230032442).

The spelling of 221110021320 in words is "two hundred twenty-one billion, one hundred ten million, twenty-one thousand, three hundred twenty".