21120303013 has 2 divisors, whose sum is σ = 21120303014. Its totient is φ = 21120303012.

The previous prime is 21120302977. The next prime is 21120303023. The reversal of 21120303013 is 31030302112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19770328449 + 1349974564 = 140607^2 + 36742^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120303013 - 2⁹ = 21120302501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120303023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560151506 + 10560151507.

It is an arithmetic number, because the mean of its divisors is an integer number (10560151507).

Almost surely, 2^21120303013 is an apocalyptic number.

It is an amenable number.

21120303013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120303013 is an equidigital number, since it uses as much as digits as its factorization.

21120303013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21120303013 its reverse (31030302112), we get a palindrome (52150605125).

Subtracting 21120303013 from its reverse (31030302112), we obtain a palindrome (9909999099).

The spelling of 21120303013 in words is "twenty-one billion, one hundred twenty million, three hundred three thousand, thirteen".