21131024329 has 2 divisors, whose sum is σ = 21131024330. Its totient is φ = 21131024328.

The previous prime is 21131024281. The next prime is 21131024441. The reversal of 21131024329 is 92342013112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21118774329 + 12250000 = 145323^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131024329 - 2²⁷ = 20996806601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21131024297 and 21131024306.

It is not a weakly prime, because it can be changed into another prime (21131084329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565512164 + 10565512165.

It is an arithmetic number, because the mean of its divisors is an integer number (10565512165).

Almost surely, 2^21131024329 is an apocalyptic number.

It is an amenable number.

21131024329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131024329 is an equidigital number, since it uses as much as digits as its factorization.

21131024329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21131024329 in words is "twenty-one billion, one hundred thirty-one million, twenty-four thousand, three hundred twenty-nine".