21440200323 has 8 divisors (see below), whose sum is σ = 28587944128. Its totient is φ = 14292961704.

The previous prime is 21440200319. The next prime is 21440200333. The reversal of 21440200323 is 32300204412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21440200323 - 2² = 21440200319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21440200323.

It is not an unprimeable number, because it can be changed into a prime (21440200333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12661 + ... + 207462.

It is an arithmetic number, because the mean of its divisors is an integer number (3573493016).

Almost surely, 2^21440200323 is an apocalyptic number.

21440200323 is a deficient number, since it is larger than the sum of its proper divisors (7147743805).

21440200323 is a wasteful number, since it uses less digits than its factorization.

21440200323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252593.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21440200323 its reverse (32300204412), we get a palindrome (53740404735).

The spelling of 21440200323 in words is "twenty-one billion, four hundred forty million, two hundred thousand, three hundred twenty-three".