21102003001 has 2 divisors, whose sum is σ = 21102003002. Its totient is φ = 21102003000.

The previous prime is 21102002951. The next prime is 21102003017. The reversal of 21102003001 is 10030020112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13628227600 + 7473775401 = 116740^2 + 86451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102003001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102003101) 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 as a sum of consecutive naturals, namely, 10551001500 + 10551001501.

It is an arithmetic number, because the mean of its divisors is an integer number (10551001501).

Almost surely, 2^21102003001 is an apocalyptic number.

It is an amenable number.

21102003001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102003001 is an equidigital number, since it uses as much as digits as its factorization.

21102003001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21102003001 its reverse (10030020112), we get a palindrome (31132023113).

The spelling of 21102003001 in words is "twenty-one billion, one hundred two million, three thousand, one".