11220021312 has 112 divisors (see below), whose sum is σ = 30034089792. Its totient is φ = 3696394240.

The previous prime is 11220021289. The next prime is 11220021317. The reversal of 11220021312 is 21312002211.

It is a junction number, because it is equal to n+sod(n) for n = 11220021291 and 11220021300.

It is not an unprimeable number, because it can be changed into a prime (11220021317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12735112 + ... + 12735992.

It is an arithmetic number, because the mean of its divisors is an integer number (268161516).

Almost surely, 2^11220021312 is an apocalyptic number.

11220021312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11220021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15017044896).

11220021312 is an abundant number, since it is smaller than the sum of its proper divisors (18814068480).

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

11220021312 is a wasteful number, since it uses less digits than its factorization.

11220021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596 (or 1586 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 11220021312 its reverse (21312002211), we get a palindrome (32532023523).

The spelling of 11220021312 in words is "eleven billion, two hundred twenty million, twenty-one thousand, three hundred twelve".