21010012019 has 2 divisors, whose sum is σ = 21010012020. Its totient is φ = 21010012018.

The previous prime is 21010011989. The next prime is 21010012027. The reversal of 21010012019 is 91021001012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010012019 is a prime.

It is a super-2 number, since 2×21010012019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21010011988 and 21010012006.

It is not a weakly prime, because it can be changed into another prime (21010012069) 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, 10505006009 + 10505006010.

It is an arithmetic number, because the mean of its divisors is an integer number (10505006010).

Almost surely, 2^21010012019 is an apocalyptic number.

21010012019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010012019 is an equidigital number, since it uses as much as digits as its factorization.

21010012019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 21010012019 in words is "twenty-one billion, ten million, twelve thousand, nineteen".