11212222121220 has 96 divisors (see below), whose sum is σ = 31911972503040. Its totient is φ = 2940625820160.

The previous prime is 11212222121213. The next prime is 11212222121227. The reversal of 11212222121220 is 2212122221211.

It is an interprime number because it is at equal distance from previous prime (11212222121213) and next prime (11212222121227).

It is not an unprimeable number, because it can be changed into a prime (11212222121227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39051909 + ... + 39337971.

It is an arithmetic number, because the mean of its divisors is an integer number (332416380240).

Almost surely, 2^{11212222121220} is an apocalyptic number.

11212222121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11212222121220 is an abundant number, since it is smaller than the sum of its proper divisors (20699750381820).

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

11212222121220 is a wasteful number, since it uses less digits than its factorization.

11212222121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296845 (or 296843 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 11212222121220 its reverse (2212122221211), we get a palindrome (13424344342431).

Subtracting from 11212222121220 its reverse (2212122221211), we obtain a palindrome (9000099900009).

The spelling of 11212222121220 in words is "eleven trillion, two hundred twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".