21003301001 has 4 divisors (see below), whose sum is σ = 21060531072. Its totient is φ = 20946070932.

The previous prime is 21003300991. The next prime is 21003301003. The reversal of 21003301001 is 10010330012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21003301001 is a prime.

It is a super-2 number, since 2×21003301001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003301003) 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 3 ways as a sum of consecutive naturals, for example, 28614485 + ... + 28615218.

It is an arithmetic number, because the mean of its divisors is an integer number (5265132768).

Almost surely, 2^21003301001 is an apocalyptic number.

It is an amenable number.

21003301001 is a deficient number, since it is larger than the sum of its proper divisors (57230071).

21003301001 is an equidigital number, since it uses as much as digits as its factorization.

21003301001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57230070.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21003301001 its reverse (10010330012), we get a palindrome (31013631013).

The spelling of 21003301001 in words is "twenty-one billion, three million, three hundred one thousand, one".