10201121111 has 4 divisors (see below), whose sum is σ = 10201610424.
Its totient is φ = 10200631800.
The previous prime is 10201121089. The next prime is 10201121129. The reversal of 10201121111 is 11112110201.
Adding to 10201121111 its reverse (11112110201), we get a palindrome (21313231312).
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 10201121111 - 222 = 10196926807 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 10201121092 and 10201121101.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (10201121141) 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, 211925 + ... + 255566.
It is an arithmetic number, because the mean of its divisors is an integer number (2550402606).
Almost surely, 210201121111 is an apocalyptic number.
10201121111 is a deficient number, since it is larger than the sum of its proper divisors (489313).
10201121111 is an equidigital number, since it uses as much as digits as its factorization.
10201121111 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 489312.
The product of its (nonzero) digits is 4, while the sum is 11.
The spelling of 10201121111 in words is "ten billion, two hundred one million, one hundred twenty-one thousand, one hundred eleven".