21031030129 has 2 divisors, whose sum is σ = 21031030130. Its totient is φ = 21031030128.

The previous prime is 21031030091. The next prime is 21031030151. The reversal of 21031030129 is 92103013012.

It is an a-pointer prime, because the next prime (21031030151) can be obtained adding 21031030129 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18728469904 + 2302560225 = 136852^2 + 47985^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031030129 - 2⁷ = 21031030001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21031630129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515515064 + 10515515065.

It is an arithmetic number, because the mean of its divisors is an integer number (10515515065).

Almost surely, 2^21031030129 is an apocalyptic number.

It is an amenable number.

21031030129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031030129 is an equidigital number, since it uses as much as digits as its factorization.

21031030129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 21031030129 in words is "twenty-one billion, thirty-one million, thirty thousand, one hundred twenty-nine".