21404203001 has 4 divisors (see below), whose sum is σ = 21982695012. Its totient is φ = 20825710992.

The previous prime is 21404202947. The next prime is 21404203033. The reversal of 21404203001 is 10030240412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11439372025 + 9964830976 = 106955^2 + 99824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21404203001 is a prime.

It is a super-2 number, since 2×21404203001² (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 (21404203061) by changing a digit.

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, 289245950 + ... + 289246023.

It is an arithmetic number, because the mean of its divisors is an integer number (5495673753).

Almost surely, 2^21404203001 is an apocalyptic number.

It is an amenable number.

21404203001 is a deficient number, since it is larger than the sum of its proper divisors (578492011).

21404203001 is an equidigital number, since it uses as much as digits as its factorization.

21404203001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578492010.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21404203001 its reverse (10030240412), we get a palindrome (31434443413).

The spelling of 21404203001 in words is "twenty-one billion, four hundred four million, two hundred three thousand, one".