21440212003 has 6 divisors (see below), whose sum is σ = 24940654836. Its totient is φ = 18377324532.

The previous prime is 21440211979. The next prime is 21440212043. The reversal of 21440212003 is 30021204412.

It is not a de Polignac number, because 21440212003 - 2¹⁷ = 21440080931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440212043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218777625 + ... + 218777722.

It is an arithmetic number, because the mean of its divisors is an integer number (4156775806).

Almost surely, 2^21440212003 is an apocalyptic number.

21440212003 is a deficient number, since it is larger than the sum of its proper divisors (3500442833).

21440212003 is an equidigital number, since it uses as much as digits as its factorization.

21440212003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437555361 (or 437555354 counting only the distinct ones).

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

Adding to 21440212003 its reverse (30021204412), we get a palindrome (51461416415).

The spelling of 21440212003 in words is "twenty-one billion, four hundred forty million, two hundred twelve thousand, three".