21404023203 has 24 divisors (see below), whose sum is σ = 30760708608. Its totient is φ = 13230674928.

The previous prime is 21404023139. The next prime is 21404023217. The reversal of 21404023203 is 30232040412.

It is not a de Polignac number, because 21404023203 - 2⁶ = 21404023139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21404023203.

It is not an unprimeable number, because it can be changed into a prime (21404023283) 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, 159351 + ... + 261152.

It is an arithmetic number, because the mean of its divisors is an integer number (1281696192).

Almost surely, 2^21404023203 is an apocalyptic number.

21404023203 is a deficient number, since it is larger than the sum of its proper divisors (9356685405).

21404023203 is a wasteful number, since it uses less digits than its factorization.

21404023203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420591 (or 420572 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21404023203 its reverse (30232040412), we get a palindrome (51636063615).

The spelling of 21404023203 in words is "twenty-one billion, four hundred four million, twenty-three thousand, two hundred three".