11021121131220 has 72 divisors (see below), whose sum is σ = 33468680929320. Its totient is φ = 2935629649920.

The previous prime is 11021121131203. The next prime is 11021121131231. The reversal of 11021121131220 is 2213112112011.

It is a happy number.

11021121131220 is a `hidden beast` number, since 110 + 2 + 11 + 211 + 312 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 881112632976 + 10140008498244 = 938676^2 + 3184338^2 .

It is a super-2 number, since 2×11021121131220² (a number of 27 digits) contains 22 as substring.

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 = 11021121131193 and 11021121131202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34590825 + ... + 34907984.

It is an arithmetic number, because the mean of its divisors is an integer number (464842790685).

Almost surely, 2^{11021121131220} is an apocalyptic number.

11021121131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11021121131220 is an abundant number, since it is smaller than the sum of its proper divisors (22447559798100).

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

11021121131220 is a wasteful number, since it uses less digits than its factorization.

11021121131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69499705 (or 69499700 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 11021121131220 its reverse (2213112112011), we get a palindrome (13234233243231).

The spelling of 11021121131220 in words is "eleven trillion, twenty-one billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty".