21344340303 has 48 divisors (see below), whose sum is σ = 36239976864. Its totient is φ = 11934535680.

The previous prime is 21344340287. The next prime is 21344340313. The reversal of 21344340303 is 30304344312.

21344340303 is a `hidden beast` number, since 2 + 13 + 4 + 4 + 340 + 303 = 666.

It is not a de Polignac number, because 21344340303 - 2⁴ = 21344340287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344340313) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3488575 + ... + 3494687.

It is an arithmetic number, because the mean of its divisors is an integer number (754999518).

Almost surely, 2^21344340303 is an apocalyptic number.

21344340303 is a deficient number, since it is larger than the sum of its proper divisors (14895636561).

21344340303 is a wasteful number, since it uses less digits than its factorization.

21344340303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8856 (or 8853 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21344340303 its reverse (30304344312), we get a palindrome (51648684615).

The spelling of 21344340303 in words is "twenty-one billion, three hundred forty-four million, three hundred forty thousand, three hundred three".