21224400323 has 12 divisors (see below), whose sum is σ = 24776867160. Its totient is φ = 18128047392.

The previous prime is 21224400269. The next prime is 21224400331. The reversal of 21224400323 is 32300442212.

It is a de Polignac number, because none of the positive numbers 2^k-21224400323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21224400343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 751418 + ... + 779151.

It is an arithmetic number, because the mean of its divisors is an integer number (2064738930).

Almost surely, 2^21224400323 is an apocalyptic number.

21224400323 is a deficient number, since it is larger than the sum of its proper divisors (3552466837).

21224400323 is a wasteful number, since it uses less digits than its factorization.

21224400323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530866 (or 1530859 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21224400323 its reverse (32300442212), we get a palindrome (53524842535).

The spelling of 21224400323 in words is "twenty-one billion, two hundred twenty-four million, four hundred thousand, three hundred twenty-three".