21064087129 has 2 divisors, whose sum is σ = 21064087130. Its totient is φ = 21064087128.

The previous prime is 21064087103. The next prime is 21064087151. The reversal of 21064087129 is 92178046012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20413837129 + 650250000 = 142877^2 + 25500^2 .

It is a cyclic number.

It is not a de Polignac number, because 21064087129 - 2¹⁷ = 21063956057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21064087091 and 21064087100.

It is not a weakly prime, because it can be changed into another prime (21064087159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532043564 + 10532043565.

It is an arithmetic number, because the mean of its divisors is an integer number (10532043565).

Almost surely, 2^21064087129 is an apocalyptic number.

It is an amenable number.

21064087129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21064087129 is an equidigital number, since it uses as much as digits as its factorization.

21064087129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 21064087129 in words is "twenty-one billion, sixty-four million, eighty-seven thousand, one hundred twenty-nine".