21404421203 has 6 divisors (see below), whose sum is σ = 23527173852. Its totient is φ = 19458564620.

The previous prime is 21404421197. The next prime is 21404421221. The reversal of 21404421203 is 30212440412.

It is not a de Polignac number, because 21404421203 - 2¹⁶ = 21404355667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404421223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88447901 + ... + 88448142.

It is an arithmetic number, because the mean of its divisors is an integer number (3921195642).

Almost surely, 2^21404421203 is an apocalyptic number.

21404421203 is a deficient number, since it is larger than the sum of its proper divisors (2122752649).

21404421203 is a wasteful number, since it uses less digits than its factorization.

21404421203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176896065 (or 176896054 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21404421203 its reverse (30212440412), we get a palindrome (51616861615).

The spelling of 21404421203 in words is "twenty-one billion, four hundred four million, four hundred twenty-one thousand, two hundred three".