21331403203 has 4 divisors (see below), whose sum is σ = 23270621688. Its totient is φ = 19392184720.

The previous prime is 21331403179. The next prime is 21331403239. The reversal of 21331403203 is 30230413312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331403203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331403243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969609226 + ... + 969609247.

It is an arithmetic number, because the mean of its divisors is an integer number (5817655422).

Almost surely, 2^21331403203 is an apocalyptic number.

21331403203 is a deficient number, since it is larger than the sum of its proper divisors (1939218485).

21331403203 is a wasteful number, since it uses less digits than its factorization.

21331403203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939218484.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21331403203 its reverse (30230413312), we get a palindrome (51561816515).

The spelling of 21331403203 in words is "twenty-one billion, three hundred thirty-one million, four hundred three thousand, two hundred three".