21012100303 has 2 divisors, whose sum is σ = 21012100304. Its totient is φ = 21012100302.

The previous prime is 21012100301. The next prime is 21012100313. The reversal of 21012100303 is 30300121012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012100303 - 2¹ = 21012100301 is a prime.

Together with 21012100301, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012100301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506050151 + 10506050152.

It is an arithmetic number, because the mean of its divisors is an integer number (10506050152).

Almost surely, 2^21012100303 is an apocalyptic number.

21012100303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012100303 is an equidigital number, since it uses as much as digits as its factorization.

21012100303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21012100303 its reverse (30300121012), we get a palindrome (51312221315).

The spelling of 21012100303 in words is "twenty-one billion, twelve million, one hundred thousand, three hundred three".