21230013031 has 2 divisors, whose sum is σ = 21230013032. Its totient is φ = 21230013030.

The previous prime is 21230013017. The next prime is 21230013037. The reversal of 21230013031 is 13031003212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21230013031 - 2¹¹ = 21230010983 is a prime.

It is a super-2 number, since 2×21230013031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21230012996 and 21230013014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230013037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615006515 + 10615006516.

It is an arithmetic number, because the mean of its divisors is an integer number (10615006516).

Almost surely, 2^21230013031 is an apocalyptic number.

21230013031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230013031 is an equidigital number, since it uses as much as digits as its factorization.

21230013031 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21230013031 its reverse (13031003212), we get a palindrome (34261016243).

The spelling of 21230013031 in words is "twenty-one billion, two hundred thirty million, thirteen thousand, thirty-one".