11321021400 has 192 divisors, whose sum is σ = 37859556000. Its totient is φ = 2781941760.

The previous prime is 11321021399. The next prime is 11321021489. The reversal of 11321021400 is 412012311.

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 11321021400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7307826 + ... + 7309374.

Almost surely, 2^11321021400 is an apocalyptic number.

11321021400 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 11321021400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18929778000).

11321021400 is an abundant number, since it is smaller than the sum of its proper divisors (26538534600).

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

11321021400 is a wasteful number, since it uses less digits than its factorization.

11321021400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518 (or 2509 counting only the distinct ones).

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

Adding to 11321021400 its reverse (412012311), we get a palindrome (11733033711).

The spelling of 11321021400 in words is "eleven billion, three hundred twenty-one million, twenty-one thousand, four hundred".