20112101 has 4 divisors (see below), whose sum is σ = 20270592. Its totient is φ = 19953612.

The previous prime is 20112073. The next prime is 20112107. The reversal of 20112101 is 10121102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10121102 = 2 ⋅5060551.

It is a cyclic number.

It is not a de Polignac number, because 20112101 - 2¹⁸ = 19849957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79055 + ... + 79308.

It is an arithmetic number, because the mean of its divisors is an integer number (5067648).

Almost surely, 2^20112101 is an apocalyptic number.

It is an amenable number.

20112101 is a deficient number, since it is larger than the sum of its proper divisors (158491).

20112101 is a wasteful number, since it uses less digits than its factorization.

20112101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158490.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 20112101 is about 4484.6517144590. The cubic root of 20112101 is about 271.9479652841.

Adding to 20112101 its reverse (10121102), we get a palindrome (30233203).

Subtracting from 20112101 its reverse (10121102), we obtain a palindrome (9990999).

The spelling of 20112101 in words is "twenty million, one hundred twelve thousand, one hundred one".