21043271429 has 2 divisors, whose sum is σ = 21043271430. Its totient is φ = 21043271428.

The previous prime is 21043271423. The next prime is 21043271467. The reversal of 21043271429 is 92417234012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20200936900 + 842334529 = 142130^2 + 29023^2 .

It is a cyclic number.

It is not a de Polignac number, because 21043271429 - 2²⁴ = 21026494213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21043271423) 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, 10521635714 + 10521635715.

It is an arithmetic number, because the mean of its divisors is an integer number (10521635715).

Almost surely, 2^21043271429 is an apocalyptic number.

It is an amenable number.

21043271429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043271429 is an equidigital number, since it uses as much as digits as its factorization.

21043271429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 21043271429 in words is "twenty-one billion, forty-three million, two hundred seventy-one thousand, four hundred twenty-nine".