21002144203 has 4 divisors (see below), whose sum is σ = 21569769760. Its totient is φ = 20434518648.

The previous prime is 21002144159. The next prime is 21002144227. The reversal of 21002144203 is 30244120012.

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 21002144203 - 2⁹ = 21002143691 is a prime.

It is a super-2 number, since 2×21002144203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002144003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283812723 + ... + 283812796.

It is an arithmetic number, because the mean of its divisors is an integer number (5392442440).

Almost surely, 2^21002144203 is an apocalyptic number.

21002144203 is a deficient number, since it is larger than the sum of its proper divisors (567625557).

21002144203 is an equidigital number, since it uses as much as digits as its factorization.

21002144203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567625556.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21002144203 its reverse (30244120012), we get a palindrome (51246264215).

The spelling of 21002144203 in words is "twenty-one billion, two million, one hundred forty-four thousand, two hundred three".