20021019840067 has 2 divisors, whose sum is σ = 20021019840068. Its totient is φ = 20021019840066.

The previous prime is 20021019840053. The next prime is 20021019840071. The reversal of 20021019840067 is 76004891012002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021019840067 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021019843067) 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, 10010509920033 + 10010509920034.

It is an arithmetic number, because the mean of its divisors is an integer number (10010509920034).

Almost surely, 2^{20021019840067} is an apocalyptic number.

20021019840067 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021019840067 is an equidigital number, since it uses as much as digits as its factorization.

20021019840067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 20021019840067 in words is "twenty trillion, twenty-one billion, nineteen million, eight hundred forty thousand, sixty-seven".