21202144403 has 8 divisors (see below), whose sum is σ = 24346960320. Its totient is φ = 18260219880.

The previous prime is 21202144391. The next prime is 21202144417. The reversal of 21202144403 is 30444120212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202144403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202144603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50722625 + ... + 50723042.

It is an arithmetic number, because the mean of its divisors is an integer number (3043370040).

Almost surely, 2^21202144403 is an apocalyptic number.

21202144403 is a deficient number, since it is larger than the sum of its proper divisors (3144815917).

21202144403 is a wasteful number, since it uses less digits than its factorization.

21202144403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101445697.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21202144403 its reverse (30444120212), we get a palindrome (51646264615).

The spelling of 21202144403 in words is "twenty-one billion, two hundred two million, one hundred forty-four thousand, four hundred three".