21230434033 has 2 divisors, whose sum is σ = 21230434034. Its totient is φ = 21230434032.

The previous prime is 21230434019. The next prime is 21230434039. The reversal of 21230434033 is 33043403212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18286611984 + 2943822049 = 135228^2 + 54257^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230434033 - 2²¹ = 21228336881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21230433989 and 21230434007.

It is not a weakly prime, because it can be changed into another prime (21230434039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615217016 + 10615217017.

It is an arithmetic number, because the mean of its divisors is an integer number (10615217017).

Almost surely, 2^21230434033 is an apocalyptic number.

It is an amenable number.

21230434033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230434033 is an equidigital number, since it uses as much as digits as its factorization.

21230434033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 21230434033 its reverse (33043403212), we get a palindrome (54273837245).

The spelling of 21230434033 in words is "twenty-one billion, two hundred thirty million, four hundred thirty-four thousand, thirty-three".