21403000203 has 16 divisors (see below), whose sum is σ = 30782196480. Its totient is φ = 13149784224.

The previous prime is 21403000183. The next prime is 21403000217. The reversal of 21403000203 is 30200030412.

It is not a de Polignac number, because 21403000203 - 2¹³ = 21402992011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21403050203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 419151 + ... + 467432.

It is an arithmetic number, because the mean of its divisors is an integer number (1923887280).

Almost surely, 2^21403000203 is an apocalyptic number.

21403000203 is a deficient number, since it is larger than the sum of its proper divisors (9379196277).

21403000203 is a wasteful number, since it uses less digits than its factorization.

21403000203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887218.

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21403000203 its reverse (30200030412), we get a palindrome (51603030615).

The spelling of 21403000203 in words is "twenty-one billion, four hundred three million, two hundred three", and thus it is an aban number.