21344554129 has 2 divisors, whose sum is σ = 21344554130. Its totient is φ = 21344554128.

The previous prime is 21344554123. The next prime is 21344554159. The reversal of 21344554129 is 92145544312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15565057600 + 5779496529 = 124760^2 + 76023^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344554129 - 2¹¹ = 21344552081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21344554091 and 21344554100.

It is not a weakly prime, because it can be changed into another prime (21344554123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672277064 + 10672277065.

It is an arithmetic number, because the mean of its divisors is an integer number (10672277065).

Almost surely, 2^21344554129 is an apocalyptic number.

It is an amenable number.

21344554129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344554129 is an equidigital number, since it uses as much as digits as its factorization.

21344554129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 40.

The spelling of 21344554129 in words is "twenty-one billion, three hundred forty-four million, five hundred fifty-four thousand, one hundred twenty-nine".