21024134129 has 2 divisors, whose sum is σ = 21024134130. Its totient is φ = 21024134128.

The previous prime is 21024134113. The next prime is 21024134161. The reversal of 21024134129 is 92143142012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14539536400 + 6484597729 = 120580^2 + 80527^2 .

It is a cyclic number.

It is not a de Polignac number, because 21024134129 - 2⁴ = 21024134113 is a prime.

It is not a weakly prime, because it can be changed into another prime (21024134029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512067064 + 10512067065.

It is an arithmetic number, because the mean of its divisors is an integer number (10512067065).

Almost surely, 2^21024134129 is an apocalyptic number.

It is an amenable number.

21024134129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024134129 is an equidigital number, since it uses as much as digits as its factorization.

21024134129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 21024134129 in words is "twenty-one billion, twenty-four million, one hundred thirty-four thousand, one hundred twenty-nine".