21323301031 has 2 divisors, whose sum is σ = 21323301032. Its totient is φ = 21323301030.

The previous prime is 21323301023. The next prime is 21323301053. The reversal of 21323301031 is 13010332312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21323301031 - 2³ = 21323301023 is a prime.

It is a super-2 number, since 2×21323301031² (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 (21323301001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661650515 + 10661650516.

It is an arithmetic number, because the mean of its divisors is an integer number (10661650516).

Almost surely, 2^21323301031 is an apocalyptic number.

21323301031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323301031 is an equidigital number, since it uses as much as digits as its factorization.

21323301031 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21323301031 its reverse (13010332312), we get a palindrome (34333633343).

The spelling of 21323301031 in words is "twenty-one billion, three hundred twenty-three million, three hundred one thousand, thirty-one".