21003211001 has 8 divisors (see below), whose sum is σ = 21920756544. Its totient is φ = 20086029040.

The previous prime is 21003210997. The next prime is 21003211007. The reversal of 21003211001 is 10011230012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21003211001 - 2² = 21003210997 is a prime.

It is a super-2 number, since 2×21003211001² (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 (21003211007) by changing a digit.

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, 30635 + ... + 207231.

It is an arithmetic number, because the mean of its divisors is an integer number (2740094568).

Almost surely, 2^21003211001 is an apocalyptic number.

It is an amenable number.

21003211001 is a deficient number, since it is larger than the sum of its proper divisors (917545543).

21003211001 is a wasteful number, since it uses less digits than its factorization.

21003211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181791.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21003211001 its reverse (10011230012), we get a palindrome (31014441013).

The spelling of 21003211001 in words is "twenty-one billion, three million, two hundred eleven thousand, one".