11220440420 has 72 divisors (see below), whose sum is σ = 27819199296. Its totient is φ = 3789567936.

The previous prime is 11220440377. The next prime is 11220440423. The reversal of 11220440420 is 2404402211.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 11220440392 and 11220440401.

It is not an unprimeable number, because it can be changed into a prime (11220440423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19784 + ... + 151103.

It is an arithmetic number, because the mean of its divisors is an integer number (386377768).

Almost surely, 2^11220440420 is an apocalyptic number.

11220440420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11220440420 is an abundant number, since it is smaller than the sum of its proper divisors (16598758876).

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

11220440420 is a wasteful number, since it uses less digits than its factorization.

11220440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170977 (or 170968 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 11220440420 its reverse (2404402211), we get a palindrome (13624842631).

The spelling of 11220440420 in words is "eleven billion, two hundred twenty million, four hundred forty thousand, four hundred twenty".