11212211121220 has 48 divisors (see below), whose sum is σ = 25089475466160. Its totient is φ = 4194181914624.

The previous prime is 11212211121211. The next prime is 11212211121247. The reversal of 11212211121220 is 2212111221211.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 27614462976 + 11184596658244 = 166176^2 + 3344338^2 .

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, 104969205 + ... + 105075964.

It is an arithmetic number, because the mean of its divisors is an integer number (522697405545).

Almost surely, 2^{11212211121220} is an apocalyptic number.

11212211121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11212211121220 is an abundant number, since it is smaller than the sum of its proper divisors (13877264344940).

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

11212211121220 is a wasteful number, since it uses less digits than its factorization.

11212211121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210045352 (or 210045350 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11212211121220 its reverse (2212111221211), we get a palindrome (13424322342431).

Subtracting from 11212211121220 its reverse (2212111221211), we obtain a palindrome (9000099900009).

The spelling of 11212211121220 in words is "eleven trillion, two hundred twelve billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty".