21021013303 has 2 divisors, whose sum is σ = 21021013304. Its totient is φ = 21021013302.

The previous prime is 21021013271. The next prime is 21021013313. The reversal of 21021013303 is 30331012012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21021013303 - 2⁵ = 21021013271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021013313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510506651 + 10510506652.

It is an arithmetic number, because the mean of its divisors is an integer number (10510506652).

Almost surely, 2^21021013303 is an apocalyptic number.

21021013303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021013303 is an equidigital number, since it uses as much as digits as its factorization.

21021013303 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 21021013303 its reverse (30331012012), we get a palindrome (51352025315).

The spelling of 21021013303 in words is "twenty-one billion, twenty-one million, thirteen thousand, three hundred three".