21040304284003 has 2 divisors, whose sum is σ = 21040304284004. Its totient is φ = 21040304284002.

The previous prime is 21040304283983. The next prime is 21040304284009. The reversal of 21040304284003 is 30048240304012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21040304284003 - 2²¹ = 21040302186851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21040304284009) 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, 10520152142001 + 10520152142002.

It is an arithmetic number, because the mean of its divisors is an integer number (10520152142002).

Almost surely, 2^{21040304284003} is an apocalyptic number.

21040304284003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040304284003 is an equidigital number, since it uses as much as digits as its factorization.

21040304284003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 21040304284003 its reverse (30048240304012), we get a palindrome (51088544588015).

The spelling of 21040304284003 in words is "twenty-one trillion, forty billion, three hundred four million, two hundred eighty-four thousand, three".