21233863129 has 2 divisors, whose sum is σ = 21233863130. Its totient is φ = 21233863128.

The previous prime is 21233863121. The next prime is 21233863159. The reversal of 21233863129 is 92136833212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13725294025 + 7508569104 = 117155^2 + 86652^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233863129 - 2³ = 21233863121 is a prime.

It is a super-2 number, since 2×21233863129² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21233863091 and 21233863100.

It is not a weakly prime, because it can be changed into another prime (21233863121) 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, 10616931564 + 10616931565.

It is an arithmetic number, because the mean of its divisors is an integer number (10616931565).

Almost surely, 2^21233863129 is an apocalyptic number.

It is an amenable number.

21233863129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233863129 is an equidigital number, since it uses as much as digits as its factorization.

21233863129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The spelling of 21233863129 in words is "twenty-one billion, two hundred thirty-three million, eight hundred sixty-three thousand, one hundred twenty-nine".