21102130019 has 2 divisors, whose sum is σ = 21102130020. Its totient is φ = 21102130018.

The previous prime is 21102129989. The next prime is 21102130031. The reversal of 21102130019 is 91003120112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102130019 - 2²⁴ = 21085352803 is a prime.

It is a super-2 number, since 2×21102130019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21102130079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551065009 + 10551065010.

It is an arithmetic number, because the mean of its divisors is an integer number (10551065010).

Almost surely, 2^21102130019 is an apocalyptic number.

21102130019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102130019 is an equidigital number, since it uses as much as digits as its factorization.

21102130019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 21102130019 in words is "twenty-one billion, one hundred two million, one hundred thirty thousand, nineteen".