21011420303 has 2 divisors, whose sum is σ = 21011420304. Its totient is φ = 21011420302.

The previous prime is 21011420267. The next prime is 21011420323. The reversal of 21011420303 is 30302411012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011420303 - 2⁶ = 21011420239 is a prime.

It is a super-2 number, since 2×21011420303² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011420323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505710151 + 10505710152.

It is an arithmetic number, because the mean of its divisors is an integer number (10505710152).

Almost surely, 2^21011420303 is an apocalyptic number.

21011420303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011420303 is an equidigital number, since it uses as much as digits as its factorization.

21011420303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21011420303 its reverse (30302411012), we get a palindrome (51313831315).

The spelling of 21011420303 in words is "twenty-one billion, eleven million, four hundred twenty thousand, three hundred three".