21202001003 has 2 divisors, whose sum is σ = 21202001004. Its totient is φ = 21202001002.

The previous prime is 21202000997. The next prime is 21202001017. The reversal of 21202001003 is 30010020212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202001003 - 2⁸ = 21202000747 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202001033) 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 as a sum of consecutive naturals, namely, 10601000501 + 10601000502.

It is an arithmetic number, because the mean of its divisors is an integer number (10601000502).

Almost surely, 2^21202001003 is an apocalyptic number.

21202001003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202001003 is an equidigital number, since it uses as much as digits as its factorization.

21202001003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21202001003 its reverse (30010020212), we get a palindrome (51212021215).

The spelling of 21202001003 in words is "twenty-one billion, two hundred two million, one thousand, three".