11311221450 has 96 divisors (see below), whose sum is σ = 29006268480. Its totient is φ = 2915084800.

The previous prime is 11311221443. The next prime is 11311221461. The reversal of 11311221450 is 5412211311.

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, 649456 + ... + 666644.

It is an arithmetic number, because the mean of its divisors is an integer number (302148630).

Almost surely, 2^11311221450 is an apocalyptic number.

11311221450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11311221450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14503134240).

11311221450 is an abundant number, since it is smaller than the sum of its proper divisors (17695047030).

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

11311221450 is a wasteful number, since it uses less digits than its factorization.

11311221450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17352 (or 17347 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 11311221450 its reverse (5412211311), we get a palindrome (16723432761).

The spelling of 11311221450 in words is "eleven billion, three hundred eleven million, two hundred twenty-one thousand, four hundred fifty".