21011452603 has 2 divisors, whose sum is σ = 21011452604. Its totient is φ = 21011452602.

The previous prime is 21011452421. The next prime is 21011452607. The reversal of 21011452603 is 30625411012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011452603 - 2¹⁷ = 21011321531 is a prime.

It is a super-2 number, since 2×21011452603² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21011452607) 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, 10505726301 + 10505726302.

It is an arithmetic number, because the mean of its divisors is an integer number (10505726302).

Almost surely, 2^21011452603 is an apocalyptic number.

21011452603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011452603 is an equidigital number, since it uses as much as digits as its factorization.

21011452603 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 25.

Adding to 21011452603 its reverse (30625411012), we get a palindrome (51636863615).

The spelling of 21011452603 in words is "twenty-one billion, eleven million, four hundred fifty-two thousand, six hundred three".