20100101111 has 4 divisors (see below), whose sum is σ = 20160826824. Its totient is φ = 20039375400.

The previous prime is 20100101101. The next prime is 20100101117. The reversal of 20100101111 is 11110100102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11110100102 = 2 ⋅5555050051.

It is a cyclic number.

It is not a de Polignac number, because 20100101111 - 2¹⁰ = 20100100087 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 (20100101117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30362360 + ... + 30363021.

It is an arithmetic number, because the mean of its divisors is an integer number (5040206706).

Almost surely, 2^20100101111 is an apocalyptic number.

20100101111 is a deficient number, since it is larger than the sum of its proper divisors (60725713).

20100101111 is an equidigital number, since it uses as much as digits as its factorization.

20100101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60725712.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 20100101111 its reverse (11110100102), we get a palindrome (31210201213).

The spelling of 20100101111 in words is "twenty billion, one hundred million, one hundred one thousand, one hundred eleven".