20211020100111 has 16 divisors (see below), whose sum is σ = 27012035343744. Its totient is φ = 13442043902304.

The previous prime is 20211020100107. The next prime is 20211020100157. The reversal of 20211020100111 is 11100102011202.

It is not a de Polignac number, because 20211020100111 - 2² = 20211020100107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211020100511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2020501 + ... + 6671166.

It is an arithmetic number, because the mean of its divisors is an integer number (1688252208984).

Almost surely, 2^{20211020100111} is an apocalyptic number.

20211020100111 is a deficient number, since it is larger than the sum of its proper divisors (6801015243633).

20211020100111 is a wasteful number, since it uses less digits than its factorization.

20211020100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8693510.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20211020100111 its reverse (11100102011202), we get a palindrome (31311122111313).

The spelling of 20211020100111 in words is "twenty trillion, two hundred eleven billion, twenty million, one hundred thousand, one hundred eleven".