21300203129 has 2 divisors, whose sum is σ = 21300203130. Its totient is φ = 21300203128.

The previous prime is 21300203051. The next prime is 21300203153. The reversal of 21300203129 is 92130200312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16577077504 + 4723125625 = 128752^2 + 68725^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300203129 - 2²⁰ = 21299154553 is a prime.

It is a super-2 number, since 2×21300203129² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21300203189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650101564 + 10650101565.

It is an arithmetic number, because the mean of its divisors is an integer number (10650101565).

Almost surely, 2^21300203129 is an apocalyptic number.

It is an amenable number.

21300203129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300203129 is an equidigital number, since it uses as much as digits as its factorization.

21300203129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21300203129 in words is "twenty-one billion, three hundred million, two hundred three thousand, one hundred twenty-nine".