20821966307067 has 4 divisors (see below), whose sum is σ = 27762621742760. Its totient is φ = 13881310871376.

The previous prime is 20821966307059. The next prime is 20821966307081. The reversal of 20821966307067 is 76070366912802.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20821966307067 - 2³ = 20821966307059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20821966306998 and 20821966307016.

It is not an unprimeable number, because it can be changed into a prime (20821966307027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3470327717842 + ... + 3470327717847.

It is an arithmetic number, because the mean of its divisors is an integer number (6940655435690).

Almost surely, 2^{20821966307067} is an apocalyptic number.

20821966307067 is a deficient number, since it is larger than the sum of its proper divisors (6940655435693).

20821966307067 is an equidigital number, since it uses as much as digits as its factorization.

20821966307067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940655435692.

The product of its (nonzero) digits is 9144576, while the sum is 57.

The spelling of 20821966307067 in words is "twenty trillion, eight hundred twenty-one billion, nine hundred sixty-six million, three hundred seven thousand, sixty-seven".