11021220400 has 60 divisors (see below), whose sum is σ = 26594329600. Its totient is φ = 4389200640.

The previous prime is 11021220391. The next prime is 11021220433. The reversal of 11021220400 is 402212011.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31441 + ... + 151759.

Almost surely, 2^11021220400 is an apocalyptic number.

11021220400 is a gapful number since it is divisible by the number (10) 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 11021220400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13297164800).

11021220400 is an abundant number, since it is smaller than the sum of its proper divisors (15573109200).

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

11021220400 is a wasteful number, since it uses less digits than its factorization.

11021220400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120566 (or 120555 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 11021220400 its reverse (402212011), we get a palindrome (11423432411).

The spelling of 11021220400 in words is "eleven billion, twenty-one million, two hundred twenty thousand, four hundred".