20021100100111 has 48 divisors (see below), whose sum is σ = 22395330220032. Its totient is φ = 17881607399040.

The previous prime is 20021100100069. The next prime is 20021100100121. The reversal of 20021100100111 is 11100100112002.

It is not a de Polignac number, because 20021100100111 - 2¹⁵ = 20021100067343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021100100121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3638212786 + ... + 3638218288.

It is an arithmetic number, because the mean of its divisors is an integer number (466569379584).

Almost surely, 2^{20021100100111} is an apocalyptic number.

20021100100111 is a deficient number, since it is larger than the sum of its proper divisors (2374230119921).

20021100100111 is a wasteful number, since it uses less digits than its factorization.

20021100100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7132 (or 7121 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20021100100111 its reverse (11100100112002), we get a palindrome (31121200212113).

The spelling of 20021100100111 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred thousand, one hundred eleven".