21000010000019 has 2 divisors, whose sum is σ = 21000010000020. Its totient is φ = 21000010000018.

The previous prime is 21000009999967. The next prime is 21000010000087. The reversal of 21000010000019 is 91000001000012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000010000019 - 2¹⁶ = 21000009934483 is a prime.

It is a super-2 number, since 2×21000010000019² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000009999958 and 21000010000012.

It is not a weakly prime, because it can be changed into another prime (21000018000019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500005000009 + 10500005000010.

It is an arithmetic number, because the mean of its divisors is an integer number (10500005000010).

Almost surely, 2^{21000010000019} is an apocalyptic number.

21000010000019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000010000019 is an equidigital number, since it uses as much as digits as its factorization.

21000010000019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The spelling of 21000010000019 in words is "twenty-one trillion, ten million, nineteen", and thus it is an aban number and an uban number.