21404231303 has 24 divisors (see below), whose sum is σ = 27437710608. Its totient is φ = 16541352576.

The previous prime is 21404231297. The next prime is 21404231351. The reversal of 21404231303 is 30313240412.

It is not a de Polignac number, because 21404231303 - 2⁴ = 21404231287 is a prime.

It is a super-2 number, since 2×21404231303² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404231393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 363326 + ... + 418107.

It is an arithmetic number, because the mean of its divisors is an integer number (1143237942).

Almost surely, 2^21404231303 is an apocalyptic number.

21404231303 is a deficient number, since it is larger than the sum of its proper divisors (6033479305).

21404231303 is a wasteful number, since it uses less digits than its factorization.

21404231303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781503 (or 781496 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21404231303 its reverse (30313240412), we get a palindrome (51717471715).

The spelling of 21404231303 in words is "twenty-one billion, four hundred four million, two hundred thirty-one thousand, three hundred three".