21003001004 has 24 divisors (see below), whose sum is σ = 36845404848. Its totient is φ = 10475769920.

The previous prime is 21003001001. The next prime is 21003001007. The reversal of 21003001004 is 40010030012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21003001001) and next prime (21003001007).

It is a super-2 number, since 2×21003001004² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003001001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5360054 + ... + 5363970.

It is an arithmetic number, because the mean of its divisors is an integer number (1535225202).

Almost surely, 2^21003001004 is an apocalyptic number.

It is an amenable number.

21003001004 is a deficient number, since it is larger than the sum of its proper divisors (15842403844).

21003001004 is a wasteful number, since it uses less digits than its factorization.

21003001004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6865 (or 6863 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21003001004 its reverse (40010030012), we get a palindrome (61013031016).

The spelling of 21003001004 in words is "twenty-one billion, three million, one thousand, four".