21443031203 has 4 divisors (see below), whose sum is σ = 23392397688. Its totient is φ = 19493664720.

The previous prime is 21443031199. The next prime is 21443031217. The reversal of 21443031203 is 30213034412.

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 21443031203 - 2² = 21443031199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21443031263) 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, 974683226 + ... + 974683247.

It is an arithmetic number, because the mean of its divisors is an integer number (5848099422).

Almost surely, 2^21443031203 is an apocalyptic number.

21443031203 is a deficient number, since it is larger than the sum of its proper divisors (1949366485).

21443031203 is a wasteful number, since it uses less digits than its factorization.

21443031203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949366484.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21443031203 its reverse (30213034412), we get a palindrome (51656065615).

The spelling of 21443031203 in words is "twenty-one billion, four hundred forty-three million, thirty-one thousand, two hundred three".