21230300129 has 2 divisors, whose sum is σ = 21230300130. Its totient is φ = 21230300128.

The previous prime is 21230300083. The next prime is 21230300197. The reversal of 21230300129 is 92100303212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13595560000 + 7634740129 = 116600^2 + 87377^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230300129 - 2¹² = 21230296033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230300629) 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, 10615150064 + 10615150065.

It is an arithmetic number, because the mean of its divisors is an integer number (10615150065).

Almost surely, 2^21230300129 is an apocalyptic number.

It is an amenable number.

21230300129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230300129 is an equidigital number, since it uses as much as digits as its factorization.

21230300129 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 21230300129 in words is "twenty-one billion, two hundred thirty million, three hundred thousand, one hundred twenty-nine".