11220021201220 has 24 divisors (see below), whose sum is σ = 25374509486424. Its totient is φ = 4142777058816.

The previous prime is 11220021201133. The next prime is 11220021201223. The reversal of 11220021201220 is 2210212002211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 107038900224 + 11112982300996 = 327168^2 + 3333614^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11220021201194 and 11220021201203.

It is not an unprimeable number, because it can be changed into a prime (11220021201223) 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, 21576963589 + ... + 21576964108.

It is an arithmetic number, because the mean of its divisors is an integer number (1057271228601).

Almost surely, 2^{11220021201220} is an apocalyptic number.

11220021201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11220021201220 is an abundant number, since it is smaller than the sum of its proper divisors (14154488285204).

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

11220021201220 is a wasteful number, since it uses less digits than its factorization.

11220021201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43153927719 (or 43153927717 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 11220021201220 its reverse (2210212002211), we get a palindrome (13430233203431).

The spelling of 11220021201220 in words is "eleven trillion, two hundred twenty billion, twenty-one million, two hundred one thousand, two hundred twenty".