11021221001220 has 24 divisors (see below), whose sum is σ = 30859418803584. Its totient is φ = 2938992266976.

The previous prime is 11021221001209. The next prime is 11021221001221. The reversal of 11021221001220 is 2210012212011.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 11021221001220.

It is not an unprimeable number, because it can be changed into a prime (11021221001221) 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, 91843508284 + ... + 91843508403.

It is an arithmetic number, because the mean of its divisors is an integer number (1285809116816).

Almost surely, 2^{11021221001220} is an apocalyptic number.

11021221001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11021221001220 is an abundant number, since it is smaller than the sum of its proper divisors (19838197802364).

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

11021221001220 is a wasteful number, since it uses less digits than its factorization.

11021221001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183687016699 (or 183687016697 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11021221001220 its reverse (2210012212011), we get a palindrome (13231233213231).

The spelling of 11021221001220 in words is "eleven trillion, twenty-one billion, two hundred twenty-one million, one thousand, two hundred twenty".