21303303031 has 2 divisors, whose sum is σ = 21303303032. Its totient is φ = 21303303030.

The previous prime is 21303303011. The next prime is 21303303103. The reversal of 21303303031 is 13030330312.

Together with next prime (21303303103) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21303303031 - 2⁹ = 21303302519 is a prime.

It is a super-2 number, since 2×21303303031² (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 (21303303011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651651515 + 10651651516.

It is an arithmetic number, because the mean of its divisors is an integer number (10651651516).

Almost surely, 2^21303303031 is an apocalyptic number.

21303303031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303303031 is an equidigital number, since it uses as much as digits as its factorization.

21303303031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 19.

Adding to 21303303031 its reverse (13030330312), we get a palindrome (34333633343).

The spelling of 21303303031 in words is "twenty-one billion, three hundred three million, three hundred three thousand, thirty-one".