21144404203 has 8 divisors (see below), whose sum is σ = 22775724608. Its totient is φ = 19513773504.

The previous prime is 21144404167. The next prime is 21144404209. The reversal of 21144404203 is 30240444112.

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

It is a cyclic number.

It is not a de Polignac number, because 21144404203 - 2⁹ = 21144403691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21144404209) 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, 107850 + ... + 232207.

It is an arithmetic number, because the mean of its divisors is an integer number (2846965576).

Almost surely, 2^21144404203 is an apocalyptic number.

21144404203 is a deficient number, since it is larger than the sum of its proper divisors (1631320405).

21144404203 is a wasteful number, since it uses less digits than its factorization.

21144404203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344853.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21144404203 its reverse (30240444112), we get a palindrome (51384848315).

The spelling of 21144404203 in words is "twenty-one billion, one hundred forty-four million, four hundred four thousand, two hundred three".