21234117329 has 2 divisors, whose sum is σ = 21234117330. Its totient is φ = 21234117328.

The previous prime is 21234117313. The next prime is 21234117343. The reversal of 21234117329 is 92371143212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13824350929 + 7409766400 = 117577^2 + 86080^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234117329 - 2⁴ = 21234117313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21234117349) 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, 10617058664 + 10617058665.

It is an arithmetic number, because the mean of its divisors is an integer number (10617058665).

Almost surely, 2^21234117329 is an apocalyptic number.

It is an amenable number.

21234117329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234117329 is an equidigital number, since it uses as much as digits as its factorization.

21234117329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The spelling of 21234117329 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventeen thousand, three hundred twenty-nine".