21003403244 has 12 divisors (see below), whose sum is σ = 38690479800. Its totient is φ = 9948980448.

The previous prime is 21003403237. The next prime is 21003403261. The reversal of 21003403244 is 44230430012.

It is a super-2 number, since 2×21003403244² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138180209 + ... + 138180360.

It is an arithmetic number, because the mean of its divisors is an integer number (3224206650).

Almost surely, 2^21003403244 is an apocalyptic number.

It is an amenable number.

21003403244 is a deficient number, since it is larger than the sum of its proper divisors (17687076556).

21003403244 is a wasteful number, since it uses less digits than its factorization.

21003403244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276360592 (or 276360590 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21003403244 its reverse (44230430012), we get a palindrome (65233833256).

The spelling of 21003403244 in words is "twenty-one billion, three million, four hundred three thousand, two hundred forty-four".