20111202101 has 4 divisors (see below), whose sum is σ = 20111681292. Its totient is φ = 20110722912.

The previous prime is 20111202049. The next prime is 20111202103. The reversal of 20111202101 is 10120211102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2521546225 + 17589655876 = 50215^2 + 132626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111202101 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 (20111202103) 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 3 ways as a sum of consecutive naturals, for example, 169880 + ... + 262833.

It is an arithmetic number, because the mean of its divisors is an integer number (5027920323).

Almost surely, 2^20111202101 is an apocalyptic number.

It is an amenable number.

20111202101 is a deficient number, since it is larger than the sum of its proper divisors (479191).

20111202101 is an equidigital number, since it uses as much as digits as its factorization.

20111202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479190.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20111202101 its reverse (10120211102), we get a palindrome (30231413203).

Subtracting from 20111202101 its reverse (10120211102), we obtain a palindrome (9990990999).

The spelling of 20111202101 in words is "twenty billion, one hundred eleven million, two hundred two thousand, one hundred one".