21432301403 has 4 divisors (see below), whose sum is σ = 21439950408. Its totient is φ = 21424652400.

The previous prime is 21432301381. The next prime is 21432301447. The reversal of 21432301403 is 30410323412.

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 21432301403 - 2¹⁸ = 21432039259 is a prime.

It is a super-3 number, since 3×21432301403³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21432301493) 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, 3820298 + ... + 3825903.

It is an arithmetic number, because the mean of its divisors is an integer number (5359987602).

Almost surely, 2^21432301403 is an apocalyptic number.

21432301403 is a deficient number, since it is larger than the sum of its proper divisors (7649005).

21432301403 is an equidigital number, since it uses as much as digits as its factorization.

21432301403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7649004.

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

Adding to 21432301403 its reverse (30410323412), we get a palindrome (51842624815).

The spelling of 21432301403 in words is "twenty-one billion, four hundred thirty-two million, three hundred one thousand, four hundred three".