21324750929 has 2 divisors, whose sum is σ = 21324750930. Its totient is φ = 21324750928.

The previous prime is 21324750919. The next prime is 21324750943. The reversal of 21324750929 is 92905742312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18009640000 + 3315110929 = 134200^2 + 57577^2 .

It is a cyclic number.

It is not a de Polignac number, because 21324750929 - 2²⁰ = 21323702353 is a prime.

It is a super-3 number, since 3×21324750929³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21324750929.

It is not a weakly prime, because it can be changed into another prime (21324750919) 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, 10662375464 + 10662375465.

It is an arithmetic number, because the mean of its divisors is an integer number (10662375465).

Almost surely, 2^21324750929 is an apocalyptic number.

It is an amenable number.

21324750929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324750929 is an equidigital number, since it uses as much as digits as its factorization.

21324750929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 21324750929 in words is "twenty-one billion, three hundred twenty-four million, seven hundred fifty thousand, nine hundred twenty-nine".