21314129929 has 2 divisors, whose sum is σ = 21314129930. Its totient is φ = 21314129928.

The previous prime is 21314129869. The next prime is 21314129953. The reversal of 21314129929 is 92992141312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18214201600 + 3099928329 = 134960^2 + 55677^2 .

It is a cyclic number.

It is not a de Polignac number, because 21314129929 - 2⁷ = 21314129801 is a prime.

It is not a weakly prime, because it can be changed into another prime (21314129999) 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, 10657064964 + 10657064965.

It is an arithmetic number, because the mean of its divisors is an integer number (10657064965).

Almost surely, 2^21314129929 is an apocalyptic number.

It is an amenable number.

21314129929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21314129929 is an equidigital number, since it uses as much as digits as its factorization.

21314129929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The spelling of 21314129929 in words is "twenty-one billion, three hundred fourteen million, one hundred twenty-nine thousand, nine hundred twenty-nine".