21020130799 has 2 divisors, whose sum is σ = 21020130800. Its totient is φ = 21020130798.

The previous prime is 21020130737. The next prime is 21020130821. The reversal of 21020130799 is 99703102012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020130799 - 2¹⁹ = 21019606511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020130499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510065399 + 10510065400.

It is an arithmetic number, because the mean of its divisors is an integer number (10510065400).

Almost surely, 2^21020130799 is an apocalyptic number.

21020130799 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020130799 is an equidigital number, since it uses as much as digits as its factorization.

21020130799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The spelling of 21020130799 in words is "twenty-one billion, twenty million, one hundred thirty thousand, seven hundred ninety-nine".