21003042244 has 24 divisors (see below), whose sum is σ = 40023950400. Its totient is φ = 9605746080.

The previous prime is 21003042239. The next prime is 21003042259. The reversal of 21003042244 is 44224030012.

It is a happy number.

It is a super-2 number, since 2×21003042244² (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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4762552 + ... + 4766959.

It is an arithmetic number, because the mean of its divisors is an integer number (1667664600).

Almost surely, 2^21003042244 is an apocalyptic number.

It is an amenable number.

21003042244 is a deficient number, since it is larger than the sum of its proper divisors (19020908156).

21003042244 is a wasteful number, since it uses less digits than its factorization.

21003042244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9529563 (or 9529561 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21003042244 its reverse (44224030012), we get a palindrome (65227072256).

The spelling of 21003042244 in words is "twenty-one billion, three million, forty-two thousand, two hundred forty-four".