20021100211121 has 16 divisors (see below), whose sum is σ = 20415532076928. Its totient is φ = 19627290883200.

The previous prime is 20021100211081. The next prime is 20021100211127. The reversal of 20021100211121 is 12111200112002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021100211121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021100211096 and 20021100211105.

It is not an unprimeable number, because it can be changed into a prime (20021100211127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500870666 + ... + 500910636.

It is an arithmetic number, because the mean of its divisors is an integer number (1275970754808).

Almost surely, 2^{20021100211121} is an apocalyptic number.

It is an amenable number.

20021100211121 is a deficient number, since it is larger than the sum of its proper divisors (394431865807).

20021100211121 is a wasteful number, since it uses less digits than its factorization.

20021100211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47512.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20021100211121 its reverse (12111200112002), we get a palindrome (32132300323123).

The spelling of 20021100211121 in words is "twenty trillion, twenty-one billion, one hundred million, two hundred eleven thousand, one hundred twenty-one".