21313443224 has 8 divisors (see below), whose sum is σ = 39962706060. Its totient is φ = 10656721608.

The previous prime is 21313443223. The next prime is 21313443257. The reversal of 21313443224 is 42234431312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313443223) 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 as a sum of consecutive naturals, namely, 1332090194 + ... + 1332090209.

Almost surely, 2^21313443224 is an apocalyptic number.

It is an amenable number.

21313443224 is a deficient number, since it is larger than the sum of its proper divisors (18649262836).

21313443224 is a wasteful number, since it uses less digits than its factorization.

21313443224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664180409 (or 2664180405 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

Adding to 21313443224 its reverse (42234431312), we get a palindrome (63547874536).

The spelling of 21313443224 in words is "twenty-one billion, three hundred thirteen million, four hundred forty-three thousand, two hundred twenty-four".