221131232201220 has 48 divisors (see below), whose sum is σ = 675455400180288. Its totient is φ = 53607571442560.

The previous prime is 221131232201141. The next prime is 221131232201263. The reversal of 221131232201220 is 22102232131122.

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, 167523660099 + ... + 167523661418.

It is an arithmetic number, because the mean of its divisors is an integer number (14071987503756).

Almost surely, 2^{221131232201220} is an apocalyptic number.

221131232201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221131232201220 is an abundant number, since it is smaller than the sum of its proper divisors (454324167979068).

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

221131232201220 is a wasteful number, since it uses less digits than its factorization.

221131232201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335047321540 (or 335047321538 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 221131232201220 its reverse (22102232131122), we get a palindrome (243233464332342).

The spelling of 221131232201220 in words is "two hundred twenty-one trillion, one hundred thirty-one billion, two hundred thirty-two million, two hundred one thousand, two hundred twenty".