21313424244 has 24 divisors (see below), whose sum is σ = 56835798208. Its totient is φ = 6089549760.

The previous prime is 21313424243. The next prime is 21313424281. The reversal of 21313424244 is 44242431312.

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 (21313424243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126865537 + ... + 126865704.

Almost surely, 2^21313424244 is an apocalyptic number.

It is an amenable number.

21313424244 is an abundant number, since it is smaller than the sum of its proper divisors (35522373964).

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

21313424244 is a wasteful number, since it uses less digits than its factorization.

21313424244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253731255 (or 253731253 counting only the distinct ones).

The product of its digits is 18432, while the sum is 30.

Adding to 21313424244 its reverse (44242431312), we get a palindrome (65555855556).

The spelling of 21313424244 in words is "twenty-one billion, three hundred thirteen million, four hundred twenty-four thousand, two hundred forty-four".