21313303403 has 4 divisors (see below), whose sum is σ = 24358061040. Its totient is φ = 18268545768.

The previous prime is 21313303367. The next prime is 21313303411. The reversal of 21313303403 is 30430331312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21313303403 - 2²⁰ = 21312254827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313303423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522378808 + ... + 1522378821.

It is an arithmetic number, because the mean of its divisors is an integer number (6089515260).

Almost surely, 2^21313303403 is an apocalyptic number.

21313303403 is a deficient number, since it is larger than the sum of its proper divisors (3044757637).

21313303403 is an equidigital number, since it uses as much as digits as its factorization.

21313303403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044757636.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21313303403 its reverse (30430331312), we get a palindrome (51743634715).

The spelling of 21313303403 in words is "twenty-one billion, three hundred thirteen million, three hundred three thousand, four hundred three".