11011211221220 has 24 divisors (see below), whose sum is σ = 26426906931264. Its totient is φ = 3775272418656.

The previous prime is 11011211221183. The next prime is 11011211221229. The reversal of 11011211221220 is 2212211211011.

11011211221220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (11011211221229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39325754222 + ... + 39325754501.

It is an arithmetic number, because the mean of its divisors is an integer number (1101121122136).

Almost surely, 2^{11011211221220} is an apocalyptic number.

11011211221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11011211221220 is an abundant number, since it is smaller than the sum of its proper divisors (15415695710044).

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

11011211221220 is a wasteful number, since it uses less digits than its factorization.

11011211221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78651508739 (or 78651508737 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11011211221220 its reverse (2212211211011), we get a palindrome (13223422432231).

The spelling of 11011211221220 in words is "eleven trillion, eleven billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty".