21324455436 has 24 divisors (see below), whose sum is σ = 49759665984. Its totient is φ = 7107779920.

The previous prime is 21324455431. The next prime is 21324455437. The reversal of 21324455436 is 63455442312.

It is a junction number, because it is equal to n+sod(n) for n = 21324455394 and 21324455403.

It is not an unprimeable number, because it can be changed into a prime (21324455431) 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, 289651 + ... + 355733.

It is an arithmetic number, because the mean of its divisors is an integer number (2073319416).

Almost surely, 2^21324455436 is an apocalyptic number.

It is an amenable number.

21324455436 is an abundant number, since it is smaller than the sum of its proper divisors (28435210548).

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

21324455436 is a wasteful number, since it uses less digits than its factorization.

21324455436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92981 (or 92979 counting only the distinct ones).

The product of its digits is 345600, while the sum is 39.

Adding to 21324455436 its reverse (63455442312), we get a palindrome (84779897748).

The spelling of 21324455436 in words is "twenty-one billion, three hundred twenty-four million, four hundred fifty-five thousand, four hundred thirty-six".