11421213144 has 128 divisors (see below), whose sum is σ = 32973177600. Its totient is φ = 3263823360.

The previous prime is 11421213137. The next prime is 11421213149. The reversal of 11421213144 is 44131212411.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11421213149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 311862 + ... + 346554.

It is an arithmetic number, because the mean of its divisors is an integer number (257602950).

Almost surely, 2^11421213144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11421213144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16486588800).

11421213144 is an abundant number, since it is smaller than the sum of its proper divisors (21551964456).

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

11421213144 is a wasteful number, since it uses less digits than its factorization.

11421213144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34785 (or 34781 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

Adding to 11421213144 its reverse (44131212411), we get a palindrome (55552425555).

The spelling of 11421213144 in words is "eleven billion, four hundred twenty-one million, two hundred thirteen thousand, one hundred forty-four".