221001221201220 has 48 divisors (see below), whose sum is σ = 687559354849920. Its totient is φ = 58933658986848.

The previous prime is 221001221201209. The next prime is 221001221201227. The reversal of 221001221201220 is 22102122100122.

It is a happy number.

221001221201220 is a `hidden beast` number, since 2 + 21 + 0 + 0 + 1 + 221 + 201 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221001221201193 and 221001221201202.

It is not an unprimeable number, because it can be changed into a prime (221001221201227) 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, 204630759832 + ... + 204630760911.

It is an arithmetic number, because the mean of its divisors is an integer number (14324153226040).

Almost surely, 2^{221001221201220} is an apocalyptic number.

221001221201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001221201220 is an abundant number, since it is smaller than the sum of its proper divisors (466558133648700).

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

221001221201220 is a wasteful number, since it uses less digits than its factorization.

221001221201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409261520761 (or 409261520753 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221001221201220 its reverse (22102122100122), we get a palindrome (243103343301342).

The spelling of 221001221201220 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty".