20201221109999 has 8 divisors (see below), whose sum is σ = 20582450702352. Its totient is φ = 19819994276160.

The previous prime is 20201221109941. The next prime is 20201221110011. The reversal of 20201221109999 is 99990112210202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20201221109999 - 2¹² = 20201221105903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201221109299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19766819 + ... + 20763659.

It is an arithmetic number, because the mean of its divisors is an integer number (2572806337794).

Almost surely, 2^{20201221109999} is an apocalyptic number.

20201221109999 is a deficient number, since it is larger than the sum of its proper divisors (381229592353).

20201221109999 is an equidigital number, since it uses as much as digits as its factorization.

20201221109999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379257.

The product of its (nonzero) digits is 104976, while the sum is 47.

The spelling of 20201221109999 in words is "twenty trillion, two hundred one billion, two hundred twenty-one million, one hundred nine thousand, nine hundred ninety-nine".