21431134203 has 4 divisors (see below), whose sum is σ = 28574845608. Its totient is φ = 14287422800.

The previous prime is 21431134171. The next prime is 21431134223. The reversal of 21431134203 is 30243113412.

It is a happy number.

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 21431134203 - 2⁵ = 21431134171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21431134223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3571855698 + ... + 3571855703.

It is an arithmetic number, because the mean of its divisors is an integer number (7143711402).

Almost surely, 2^21431134203 is an apocalyptic number.

21431134203 is a deficient number, since it is larger than the sum of its proper divisors (7143711405).

21431134203 is an equidigital number, since it uses as much as digits as its factorization.

21431134203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143711404.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21431134203 its reverse (30243113412), we get a palindrome (51674247615).

The spelling of 21431134203 in words is "twenty-one billion, four hundred thirty-one million, one hundred thirty-four thousand, two hundred three".