21113143224 has 16 divisors (see below), whose sum is σ = 52782858120. Its totient is φ = 7037714400.

The previous prime is 21113143223. The next prime is 21113143231. The reversal of 21113143224 is 42234131112.

It is a super-2 number, since 2×21113143224² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 879714301 = 21113143224 / (2 + 1 + 1 + 1 + 3 + 1 + 4 + 3 + 2 + 2 + 4).

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

It is a junction number, because it is equal to n+sod(n) for n = 21113143194 and 21113143203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113143223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439857127 + ... + 439857174.

Almost surely, 2^21113143224 is an apocalyptic number.

21113143224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21113143224 is an abundant number, since it is smaller than the sum of its proper divisors (31669714896).

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

21113143224 is a wasteful number, since it uses less digits than its factorization.

21113143224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879714310 (or 879714306 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

Adding to 21113143224 its reverse (42234131112), we get a palindrome (63347274336).

The spelling of 21113143224 in words is "twenty-one billion, one hundred thirteen million, one hundred forty-three thousand, two hundred twenty-four".