21021313303 has 2 divisors, whose sum is σ = 21021313304. Its totient is φ = 21021313302.

The previous prime is 21021313283. The next prime is 21021313307. The reversal of 21021313303 is 30331312012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21021313303 - 2⁹ = 21021312791 is a prime.

It is a super-2 number, since 2×21021313303² (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 (21021313307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510656651 + 10510656652.

It is an arithmetic number, because the mean of its divisors is an integer number (10510656652).

Almost surely, 2^21021313303 is an apocalyptic number.

21021313303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021313303 is an equidigital number, since it uses as much as digits as its factorization.

21021313303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21021313303 its reverse (30331312012), we get a palindrome (51352625315).

The spelling of 21021313303 in words is "twenty-one billion, twenty-one million, three hundred thirteen thousand, three hundred three".