20111002101 has 12 divisors (see below), whose sum is σ = 29050850400. Its totient is φ = 13406584680.

The previous prime is 20111002097. The next prime is 20111002117. The reversal of 20111002101 is 10120011102.

It is a happy number.

It is not a de Polignac number, because 20111002101 - 2² = 20111002097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111002141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142800 + ... + 246198.

It is an arithmetic number, because the mean of its divisors is an integer number (2420904200).

Almost surely, 2^20111002101 is an apocalyptic number.

It is an amenable number.

20111002101 is a deficient number, since it is larger than the sum of its proper divisors (8939848299).

20111002101 is a wasteful number, since it uses less digits than its factorization.

20111002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125016 (or 125013 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20111002101 its reverse (10120011102), we get a palindrome (30231013203).

Subtracting from 20111002101 its reverse (10120011102), we obtain a palindrome (9990990999).

The spelling of 20111002101 in words is "twenty billion, one hundred eleven million, two thousand, one hundred one".