21012001002019 has 2 divisors, whose sum is σ = 21012001002020. Its totient is φ = 21012001002018.

The previous prime is 21012001001969. The next prime is 21012001002053. The reversal of 21012001002019 is 91020010021012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012001002019 - 2¹⁹ = 21012000477731 is a prime.

It is a super-2 number, since 2×21012001002019² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012001001987 and 21012001002005.

It is not a weakly prime, because it can be changed into another prime (21012001002089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506000501009 + 10506000501010.

It is an arithmetic number, because the mean of its divisors is an integer number (10506000501010).

Almost surely, 2^{21012001002019} is an apocalyptic number.

21012001002019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012001002019 is an equidigital number, since it uses as much as digits as its factorization.

21012001002019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21012001002019 in words is "twenty-one trillion, twelve billion, one million, two thousand, nineteen".