20211231100111 has 12 divisors (see below), whose sum is σ = 21542164626024. Its totient is φ = 18957903030000.

The previous prime is 20211231100057. The next prime is 20211231100163. The reversal of 20211231100111 is 11100113211202.

It is a happy number.

It is not a de Polignac number, because 20211231100111 - 2²³ = 20211222711503 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 (20211231101111) 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 11 ways as a sum of consecutive naturals, for example, 277125865 + ... + 277198786.

It is an arithmetic number, because the mean of its divisors is an integer number (1795180385502).

Almost surely, 2^{20211231100111} is an apocalyptic number.

20211231100111 is a deficient number, since it is larger than the sum of its proper divisors (1330933525913).

20211231100111 is a wasteful number, since it uses less digits than its factorization.

20211231100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554324790 (or 554324771 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 20211231100111 its reverse (11100113211202), we get a palindrome (31311344311313).

The spelling of 20211231100111 in words is "twenty trillion, two hundred eleven billion, two hundred thirty-one million, one hundred thousand, one hundred eleven".