20021100110209 has 64 divisors (see below), whose sum is σ = 23869956096000. Its totient is φ = 16610698540800.

The previous prime is 20021100110173. The next prime is 20021100110227. The reversal of 20021100110209 is 90201100112002.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021100110209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021100110279) 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 in 63 ways as a sum of consecutive naturals, for example, 116792442 + ... + 116963740.

It is an arithmetic number, because the mean of its divisors is an integer number (372968064000).

Almost surely, 2^{20021100110209} is an apocalyptic number.

20021100110209 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20021100110209 is a deficient number, since it is larger than the sum of its proper divisors (3848855985791).

20021100110209 is a wasteful number, since it uses less digits than its factorization.

20021100110209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171646.

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

The spelling of 20021100110209 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred ten thousand, two hundred nine".