21040031029 has 2 divisors, whose sum is σ = 21040031030. Its totient is φ = 21040031028.

The previous prime is 21040031003. The next prime is 21040031059. The reversal of 21040031029 is 92013004012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21039502500 + 528529 = 145050^2 + 727^2 .

It is a cyclic number.

It is not a de Polignac number, because 21040031029 - 2⁷ = 21040030901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21040031059) 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, 10520015514 + 10520015515.

It is an arithmetic number, because the mean of its divisors is an integer number (10520015515).

Almost surely, 2^21040031029 is an apocalyptic number.

It is an amenable number.

21040031029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040031029 is an equidigital number, since it uses as much as digits as its factorization.

21040031029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 21040031029 in words is "twenty-one billion, forty million, thirty-one thousand, twenty-nine".