11211221201220 has 48 divisors (see below), whose sum is σ = 34879354849920. Its totient is φ = 2989658986848.

The previous prime is 11211221201189. The next prime is 11211221201227. The reversal of 11211221201220 is 2210212211211.

11211221201220 is a `hidden beast` number, since 1 + 1 + 21 + 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 = 11211221201193 and 11211221201202.

It is not an unprimeable number, because it can be changed into a prime (11211221201227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10380759832 + ... + 10380760911.

It is an arithmetic number, because the mean of its divisors is an integer number (726653226040).

Almost surely, 2^{11211221201220} is an apocalyptic number.

11211221201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211221201220 is an abundant number, since it is smaller than the sum of its proper divisors (23668133648700).

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

11211221201220 is a wasteful number, since it uses less digits than its factorization.

11211221201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20761520761 (or 20761520753 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11211221201220 its reverse (2210212211211), we get a palindrome (13421433412431).

The spelling of 11211221201220 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty".