21501344003 has 2 divisors, whose sum is σ = 21501344004. Its totient is φ = 21501344002.

The previous prime is 21501343999. The next prime is 21501344023. The reversal of 21501344003 is 30044310512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21501344003 - 2² = 21501343999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21501344003.

It is not a weakly prime, because it can be changed into another prime (21501344023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750672001 + 10750672002.

It is an arithmetic number, because the mean of its divisors is an integer number (10750672002).

Almost surely, 2^21501344003 is an apocalyptic number.

21501344003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21501344003 is an equidigital number, since it uses as much as digits as its factorization.

21501344003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21501344003 its reverse (30044310512), we get a palindrome (51545654515).

The spelling of 21501344003 in words is "twenty-one billion, five hundred one million, three hundred forty-four thousand, three".