21041003009 has 16 divisors (see below), whose sum is σ = 24496812480. Its totient is φ = 17902918080.

The previous prime is 21041002987. The next prime is 21041003057. The reversal of 21041003009 is 90030014012.

It is a cyclic number.

It is not a de Polignac number, because 21041003009 - 2²⁰ = 21039954433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21041003059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1142027 + ... + 1160304.

It is an arithmetic number, because the mean of its divisors is an integer number (1531050780).

Almost surely, 2^21041003009 is an apocalyptic number.

It is an amenable number.

21041003009 is a deficient number, since it is larger than the sum of its proper divisors (3455809471).

21041003009 is a wasteful number, since it uses less digits than its factorization.

21041003009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302400.

The product of its (nonzero) digits is 216, while the sum is 20.

The spelling of 21041003009 in words is "twenty-one billion, forty-one million, three thousand, nine".