21432004403 has 8 divisors (see below), whose sum is σ = 21708654240. Its totient is φ = 21156491520.

The previous prime is 21432004379. The next prime is 21432004409. The reversal of 21432004403 is 30440023412.

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

It is not a de Polignac number, because 21432004403 - 2⁶ = 21432004339 is a prime.

It is a super-2 number, since 2×21432004403² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21432004409) 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, 246263 + ... + 321728.

It is an arithmetic number, because the mean of its divisors is an integer number (2713581780).

Almost surely, 2^21432004403 is an apocalyptic number.

21432004403 is a deficient number, since it is larger than the sum of its proper divisors (276649837).

21432004403 is an equidigital number, since it uses as much as digits as its factorization.

21432004403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568477.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21432004403 its reverse (30440023412), we get a palindrome (51872027815).

The spelling of 21432004403 in words is "twenty-one billion, four hundred thirty-two million, four thousand, four hundred three".