21023254129 has 2 divisors, whose sum is σ = 21023254130. Its totient is φ = 21023254128.

The previous prime is 21023254123. The next prime is 21023254151. The reversal of 21023254129 is 92145232012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20982101904 + 41152225 = 144852^2 + 6415^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023254129 - 2²⁹ = 20486383217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21023254129.

It is not a weakly prime, because it can be changed into another prime (21023254123) 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, 10511627064 + 10511627065.

It is an arithmetic number, because the mean of its divisors is an integer number (10511627065).

Almost surely, 2^21023254129 is an apocalyptic number.

It is an amenable number.

21023254129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023254129 is an equidigital number, since it uses as much as digits as its factorization.

21023254129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21023254129 in words is "twenty-one billion, twenty-three million, two hundred fifty-four thousand, one hundred twenty-nine".